Triangular imbedding of Kn - K6. - Richard K. Guy; Gerhard Ringel (J. Comb. Theory B, 1976)

On the genus of the graph Kn × K2 or the n-prism. - Gerhard Ringel (Discret. Math., 1977)

The combinatorial map color theorem. - Gerhard Ringel (J. Graph Theory, 1977)

The genus of the n-octahedron: Regular cases. - Mark Jungerman; Gerhard Ringel (J. Graph Theory, 1978)

Maps of m-pires on the projective plane. - Brad Jackson; Gerhard Ringel (Discret. Math., 1983)

The splitting number of the complete graph. - Nora Hartsfield; Brad Jackson; Gerhard Ringel (Graphs Comb., 1985)

Heawood's empire problem. - Brad Jackson; Gerhard Ringel (J. Comb. Theory B, 1985)

Hamilton surfaces for the complete even symmetric bipartite graph. - Nora Hartsfield; Brad Jackson; Gerhard Ringel (Discret. Math., 1989)

Minimal quadrangulations of nonorientable surfaces. - Nora Hartsfield; Gerhard Ringel (J. Comb. Theory A, 1989)

Minimal quadrangulations of orientable surfaces. - Nora Hartsfield; Gerhard Ringel (J. Comb. Theory B, 1989)

Quadrangular embeddings of the complete even k-partite graph. - Nora Hartsfield; Gerhard Ringel (Discret. Math., 1990)

Clean triangulations. - Nora Hartsfield; Gerhard Ringel (Comb., 1991)

A brief review on Egmont Köhler's mathematical work. - Hanfried Lenz; Gerhard Ringel (Discret. Math., 1991)

Two trees in maximal planar bipartite graphs. - Gerhard Ringel (J. Graph Theory, 1993)

Pearls in graph theory - a comprehensive introduction (Reviewed Edition). - Nora Hartsfield; Gerhard Ringel (Academic Press, 1994)

Nonseparable graphs with a given number of cycles. - Ranko Scepanovic; Gerhard Ringel; Dragan Marusic; Gek Ling Chia; Brian Alspach (J. Graph Theory, 1994)

On the tree number of regular graphs. - Gerhard Ringel; Anna S. Lladó; Oriol Serra (Discret. Math., 1997)

Variations on Ringel's earth-moon problem. - Brad Jackson; Gerhard Ringel (Discret. Math., 2000)