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1979 | ||
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2 | EE | David J. Pengelley, M. Jungerman: Index four orientable embeddings and case zero of the Heawood conjecture. J. Comb. Theory, Ser. B 26(2): 131-144 (1979) |
1 | EE | M. Jungerman: The nonorientable genus of the symmetric quadripartite graph. J. Comb. Theory, Ser. B 26(2): 154-158 (1979) |
1 | David J. Pengelley | [2] |