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- G Ringel, J W Youngs
- Proceedings of the National Academy of Sciences…
- 1968

- Nora Hartsfield, Gerhard Ringel
- J. Comb. Theory, Ser. B
- 1989

- Gerhard Ringel
- Journal of Graph Theory
- 1993

- Mark Jungerman, Gerhard Ringel
- Journal of Graph Theory
- 1978

- Nora Hartsfield, Gerhard Ringel
- J. Comb. Theory, Ser. A
- 1989

Let N be a compact 2-manifold. A polyhedron on N is called a quadrangulation if each face of the polyhedron is a quadrangle (square) with four distinct vertices; no two vertices are joined by more than one edge, and the intersection of any two distinct squares is either empty or at most one edge and at most three vertices. A quadrangulation of N is called… (More)

- Brad Jackson, Gerhard Ringel
- J. Comb. Theory, Ser. B
- 1985

- Nora Hartsfield, Brad Jackson, Gerhard Ringel
- Graphs and Combinatorics
- 1985

- Gerhard Ringel
- Journal of Graph Theory
- 1977

- Nora Hartsfield, Gerhard Ringel
- Combinatorica
- 1991

and A polyhedron on a closed surface S is called a triangulation if each face is a t r iangle wi th three dist inct vertices, and the intersect ion of any two dist inct t r iangles is ei ther empty, a single vertex, or a single edge. In other words, a t r iangula t ion of S is a 2-cell embedding of a g raph into S where every 2-cell is a triangle. A t r… (More)