1. Plasmeijer, M.J., van Eekelen, M.C.J.D.: Functional Programming and Parallel Graph Rewriting. Addison-Wesley Publishing Company, Reading (1993)
2. Achten, P.M., Wierich, M.: A Tutorial to the Clean object I/O Library, version 1.1. Internal Report, Department of Functional Programming, University of Nijmegen, The Netherlands (1999), Available on the Internet:
ftp://ftp.cs.kun.nl/pub/Clean/supported/ObjectIO/doc/tutorial.11.ps.gz
3. Lecture Notes in Computer Science;P.M. Achten,1998
4. Achten, P.M., Plasmeijer, M.J.: The ins and outs of Clean I/O. Journal of Functional Programming 5(1), 81–110 (1995)
5. Gruber, D.: Action Arcade Adventure Set. Coriolis Group Books (1994), also available on the Internet:
http://www.fastgraph.com/aaas.html