Lothar Piepmeyer

Zero-Sum Ramsey Numbers modulo 3

Heiko Harborth, Lothar Piepmeyer, 1996, J. Comb. Theory, Ser. A.

On the smallest limited snake of unit disks

Heiko Harborth, Tibor Bisztriczky, Lothar Piepmeyer, 1991 .

Two-Distance Sets and the Golden Ratio

Heiko Harborth, Lothar Piepmeyer, 1993 .