The maximum number of unit distances among n points in dimension four. van Wamelen, Paul — 1999 Beiträge zur Algebra und Geometrie
Class numbers of real quadratic function fields Christian Friesen; Paul van Wamelen — 1997 Acta Arithmetica
Divisibility properties of generalized Vandermonde determinants Stanisław Spież; Jerzy Urbanowicz; Paul van Wamelen — 2003 Acta Arithmetica