| 2000 |
|---|
| 11 | EE | Brad Jackson,
Gerhard Ringel:
Variations on Ringel's earth-moon problem.
Discrete Mathematics 211: 233-242 (2000) |
| 1997 |
|---|
| 10 | EE | Gerhard Ringel,
Anna S. Lladó,
Oriol Serra:
On the tree number of regular graphs.
Discrete Mathematics 165-166: 587-595 (1997) |
| 1991 |
|---|
| 9 | | Nora Hartsfield,
Gerhard Ringel:
Clean triangulations.
Combinatorica 11(2): 145-155 (1991) |
| 8 | EE | Hanfried Lenz,
Gerhard Ringel:
A brief review on Egmont Köhler's mathematical work.
Discrete Mathematics 97(1-3): 3-16 (1991) |
| 1990 |
|---|
| 7 | EE | Nora Hartsfield,
Gerhard Ringel:
Quadrangular embeddings of the complete even k-partite graph.
Discrete Mathematics 81(1): 19-23 (1990) |
| 1989 |
|---|
| 6 | EE | Nora Hartsfield,
Brad Jackson,
Gerhard Ringel:
Hamilton surfaces for the complete even symmetric bipartite graph.
Discrete Mathematics 78(1-2): 89-94 (1989) |
| 5 | EE | Nora Hartsfield,
Gerhard Ringel:
Minimal quadrangulations of nonorientable surfaces.
J. Comb. Theory, Ser. A 50(2): 186-195 (1989) |
| 4 | EE | Nora Hartsfield,
Gerhard Ringel:
Minimal quadrangulations of orientable surfaces.
J. Comb. Theory, Ser. B 46(1): 84-95 (1989) |
| 1985 |
|---|
| 3 | EE | Brad Jackson,
Gerhard Ringel:
Heawood's empire problem.
J. Comb. Theory, Ser. B 38(2): 168-178 (1985) |
| 1983 |
|---|
| 2 | EE | Brad Jackson,
Gerhard Ringel:
Maps of m-pires on the projective plane.
Discrete Mathematics 46(1): 15-20 (1983) |
| 1976 |
|---|
| 1 | EE | Richard K. Guy,
Gerhard Ringel:
Triangular imbedding of Kn - K6.
J. Comb. Theory, Ser. B 21(2): 140-145 (1976) |
