Orbits on the Projective Line. - D. C. Van Leijenhorst (J. Comb. Theory A, 1981)

A Note on the Formula Size of the "mod k" Functions. - D. C. Van Leijenhorst (Inf. Process. Lett., 1987)

On a Recursion Connected with Tree Balancing Algorithms. - D. C. Van Leijenhorst; Theo P. van der Weide (Inf. Process. Lett., 1987)

A formal derivation of Heaps' Law. - D. C. Van Leijenhorst; Theo P. van der Weide (Inf. Sci., 2005)