Jacobus H. Koolen

Jack H. Koolen

2009
44	EE	Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: A graph-theoretical invariant of topological spaces. Appl. Math. Lett. 22(2): 159-162 (2009)
2008
43	EE	Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: Cut points in metric spaces. Appl. Math. Lett. 21(6): 545-548 (2008)
42	EE	Sejeong Bang, Hyun Kwang Kim, Jack H. Koolen, Mitsugu Hirasaka, Sung Yell Song: Preface. Discrete Mathematics 308(14): 2925 (2008)
41	EE	Aleksandar Jurisic, Jack H. Koolen, Arjana Zitnik: Triangle-free distance-regular graphs with an eigenvalue multiplicity equal to their valency and diameter 3. Eur. J. Comb. 29(1): 193-207 (2008)
40	EE	Y. B. Choe, Katharina T. Huber, Jacobus H. Koolen, Y. S. Kwon, Vincent Moulton: Counting vertices and cubes in median graphs of circular split systems. Eur. J. Comb. 29(2): 443-456 (2008)
39	EE	Kris Coolsaet, Aleksandar Jurisic, Jack H. Koolen: On triangle-free distance-regular graphs with an eigenvalue multiplicity equal to the valency. Eur. J. Comb. 29(5): 1186-1199 (2008)
38	EE	Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: Compatible decompositions and block realizations of finite metrics. Eur. J. Comb. 29(7): 1617-1633 (2008)
2007
37	EE	Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: An Algorithm for Computing Virtual Cut Points in Finite Metric Spaces. COCOA 2007: 4-10
36	EE	Jack H. Koolen, Alice Lesser, Vincent Moulton: Concerning the Relationship between Realizations and Tight Spans of Finite Metrics. Discrete & Computational Geometry 38(3): 605-614 (2007)
35	EE	S. Bang, Akira Hiraki, Jacobus H. Koolen: Delsarte clique graphs. Eur. J. Comb. 28(2): 501-516 (2007)
34	EE	S. Bang, Jacobus H. Koolen, Vincent Moulton: Two theorems concerning the Bannai-Ito conjecture. Eur. J. Comb. 28(7): 2026-2052 (2007)
2006
33	EE	S. Bang, Akira Hiraki, Jacobus H. Koolen: Improving diameter bounds for distance-regular graphs. Eur. J. Comb. 27(1): 79-89 (2006)
32	EE	Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: On the structure of the tight-span of a totally split-decomposable metric. Eur. J. Comb. 27(3): 461-479 (2006)
31	EE	Hans-Jürgen Bandelt, Victor Chepoi, Andreas W. M. Dress, Jack H. Koolen: Combinatorics of lopsided sets. Eur. J. Comb. 27(5): 669-689 (2006)
30	EE	Edwin R. van Dam, Willem H. Haemers, Jacobus H. Koolen, Edward Spence: Characterizing distance-regularity of graphs by the spectrum. J. Comb. Theory, Ser. A 113(8): 1805-1820 (2006)
2005
29	EE	Sejeong Bang, Jack H. Koolen: Some Interlacing Results for the Eigenvalues of Distance-regular graphs. Des. Codes Cryptography 34(2-3): 173-186 (2005)
28	EE	Andreas W. M. Dress, Barbara Holland, Katharina T. Huber, Jack H. Koolen, Vincent Moulton, Jan Weyer-Menkhoff: Delta additive and Delta ultra-additive maps, Gromov's trees, and the Farris transform. Discrete Applied Mathematics 146(1): 51-73 (2005)
27	EE	Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: The tight span of an antipodal metric space - Part I: : Combinatorial properties. Discrete Mathematics 303(1-3): 65-79 (2005)
26	EE	Akira Hiraki, Jack H. Koolen: A generalization of an inequality of Brouwer-Wilbrink. J. Comb. Theory, Ser. A 109(1): 181-188 (2005)
25	EE	Aleksandar Jurisic, Jack H. Koolen, Stefko Miklavic: Triangle- and pentagon-free distance-regular graphs with an eigenvalue multiplicity equal to the valency. J. Comb. Theory, Ser. B 94(2): 245-258 (2005)
2004
24	EE	Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: The Tight Span of an Antipodal Metric Space: Part II--Geometrical Properties. Discrete & Computational Geometry 31(4): 567-586 (2004)
23	EE	Jack H. Koolen, Vincent Moulton, Dragan Stevanovic: The structure of spherical graphs. Eur. J. Comb. 25(2): 299-310 (2004)
22	EE	Akira Hiraki, Jack H. Koolen: A Note on Regular Near Polygons. Graphs and Combinatorics 20(4): 485-497 (2004)
2003
21	EE	Andries E. Brouwer, Jack H. Koolen, Mikhail H. Klin: A Root Graph that is Locally the Line Graph of the Peterson Graph. Discrete Mathematics 264(1-3): 13-24 (2003)
20	EE	Andreas W. M. Dress, Jack H. Koolen, Vincent Moulton: Addendum to "on line arrangements in the hyperbolic plane" [European J. Combin.23 (2002) 549-557]. Eur. J. Comb. 24(3): 347 (2003)
19	EE	S. Bang, Jack H. Koolen, Vincent Moulton: A bound for the number of columns l(c, a, b) in the intersection array of a distance-regular graph. Eur. J. Comb. 24(7): 785-795 (2003)
18	EE	Jack H. Koolen, Vincent Moulton: Maximal Energy Bipartite Graphs. Graphs and Combinatorics 19(1): 131-135 (2003)
17	EE	Andries E. Brouwer, C. D. Godsil, Jack H. Koolen, William J. Martin: Width and dual width of subsets in polynomial association schemes. J. Comb. Theory, Ser. A 102(2): 255-271 (2003)
2002
16	EE	Aleksandar Jurisic, Jacobus H. Koolen: Krein parameters and antipodal tight graphs with diameter 3 and 4. Discrete Mathematics 244(1-3): 181-202 (2002)
15	EE	Andreas W. M. Dress, Jack H. Koolen, Vincent Moulton: On Line Arrangements in the Hyperbolic Plane. Eur. J. Comb. 23(5): 549-557 (2002)
14	EE	Jack H. Koolen, Vincent Moulton: Hyperbolic Bridged Graphs. Eur. J. Comb. 23(6): 683-699 (2002)
13	EE	Jack H. Koolen, Vincent Moulton: On a Conjecture of Bannai and Ito: There are Finitely Many Distance-regular Graphs with Degree 5, 6 or 7. Eur. J. Comb. 23(8): 987-1006 (2002)
2001
12	EE	Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton: Six Points Suffice: How to Check for Metric Consistency. Eur. J. Comb. 22(4): 465-474 (2001)
2000
11		Aleksandar Jurisic, Jack H. Koolen: A Local Approach to 1-Homogeneous Graphs. Des. Codes Cryptography 21(1/3): 127-147 (2000)
10		Jack H. Koolen, Monique Laurent, Alexander Schrijver: Equilateral Dimension of the Rectilinear Space. Des. Codes Cryptography 21(1/3): 149-164 (2000)
9	EE	Jack H. Koolen, Vincent Moulton, Udo Tönges: A Classification of the Six-point Prime Metrics. Eur. J. Comb. 21(6): 815-829 (2000)
8	EE	Aleksandar Jurisic, Jack H. Koolen: Nonexistence of some Antipodal Distance-regular Graphs of Diameter Four. Eur. J. Comb. 21(8): 1039-1046 (2000)
1999
7	EE	Sandi Klavzar, Jack H. Koolen, Henry Martyn Mulder: Graphs which Locally Mirror the Hypercube Structure. Inf. Process. Lett. 71(2): 87-90 (1999)
1998
6	EE	Jack H. Koolen: The Distance-regular Graphs with Intersection Number a1!=0 and with an Eigenvalue -1-(b1/2). Combinatorica 18(2): 227-234 (1998)
5	EE	Jack H. Koolen, Vincent Moulton, Udo Tönges: The coherency index. Discrete Mathematics 192(1-3): 205-222 (1998)
1995
4	EE	Jacobus H. Koolen: A Characterization of the Doob Graphs. J. Comb. Theory, Ser. B 65(1): 125-138 (1995)
1994
3	EE	Jack H. Koolen, Sergey V. Shpectorov: Distance-regular Graphs the Distance Matrix of which has Only One Positive Eigenvalue. Eur. J. Comb. 15(3): 269-275 (1994)
1993
2	EE	Andries E. Brouwer, Jacobus H. Koolen: A new infinite series of regular uniformly geodetic code graphs. Discrete Mathematics 120(1-3): 241-247 (1993)
1990
1	EE	J. M. van den Akker, Jacobus H. Koolen, Rob J. M. Vaessens: Perfect modes with distinct protective radii. Discrete Mathematics 81(1): 103-109 (1990)

Coauthor Index

1	J. M. van den Akker (Marjan van den Akker)	[1]
2	Hans-Jürgen Bandelt	[31]
3	S. Bang	[19] [33] [34] [35]
4	Sejeong Bang	[29] [42]
5	Andries E. Brouwer	[2] [17] [21]
6	Victor Chepoi	[31]
7	Y. B. Choe	[40]
8	Kris Coolsaet	[39]
9	Edwin R. van Dam	[30]
10	Andreas W. M. Dress	[12] [15] [20] [28] [31] [37] [38] [43] [44]
11	Chris D. Godsil (C. D. Godsil)	[17]
12	Willem H. Haemers	[30]
13	Akira Hiraki	[22] [26] [33] [35]
14	Mitsugu Hirasaka	[42]
15	Barbara Holland	[28]
16	Katharina T. Huber	[12] [24] [27] [28] [32] [37] [38] [40] [43] [44]
17	Aleksandar Jurisic	[8] [11] [16] [25] [39] [41]
18	Hyun Kwang Kim	[42]
19	Sandi Klavzar	[7]
20	Mikhail H. Klin	[21]
21	Y. S. Kwon	[40]
22	Monique Laurent	[10]
23	Alice Lesser	[36]
24	William J. Martin	[17]
25	Stefko Miklavic	[25]
26	Vincent Moulton	[5] [9] [12] [13] [14] [15] [18] [19] [20] [23] [24] [27] [28] [32] [34] [36] [37] [38] [40] [43] [44]
27	Henry Martyn Mulder	[7]
28	Alexander Schrijver	[10]
29	Sergey V. Shpectorov	[3]
30	Sung Yell Song	[42]
31	Edward Spence	[30]
32	Dragan Stevanovic	[23]
33	Udo Tönges	[5] [9]
34	Rob J. M. Vaessens	[1]
35	Jan Weyer-Menkhoff	[28]
36	Arjana Zitnik	[41]

Colors in the list of coauthors