Peter Yff

On the Dénes-Hermann Theorem: a Different Approach

Peter Yff, 1991, Eur. J. Comb..

On Subplane Partitions of a Finite Projective Plane

Peter Yff, 1977, J. Comb. Theory, Ser. A.

Another Set of Concurrent Cevians: 10678

Clark Kimberling, Peter Yff, Vasile Mihai, 2000, Am. Math. Mon..