First Class File I/O. - Marco Pil (Implementation of Functional Languages, 1996)

Dynamic Types and Type Dependent Functions. - Marco Pil (IFL, 1998)

Parallel and Distributed Programming in Concurrent Clean. - Rinus Plasmeijer; Marko C. J. D. van Eekelen; Marco Pil; Pascal R. Serrarens (Research Directions in Parallel Functional Programming, 1999)