1982 | ||
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2 | Peter Ungar: 2N Noncollinear Points Determine at Least 2N Directions. J. Comb. Theory, Ser. A 33(3): 343-347 (1982) | |
1977 | ||
1 | EE | Martin Milgram, Peter Ungar: Bounds for the genus of graphs with given Betti number. J. Comb. Theory, Ser. B 23(2-3): 227-233 (1977) |
1 | Martin Milgram | [1] |