On the Diophantine equations ax2 + bx + c = c0 c1y1 1/4cryr . - Christoph Hering (Appl. Algebra Eng. Commun. Comput., 1996)

A partial plane of order 6 constructed from the icosahedron. - Christoph Hering; Andreas Krebs (Des. Codes Cryptogr., 2007)

Naive configurations. - Christoph Hering; Andreas Krebs; Thomas Edgar (Des. Codes Cryptogr., 2014)