Copies of papers of Joost Kalker can be ordered by email :

kalker@zonnet.nl

All papers, reports and computer programs are on http://ta.twi.tudelft - Research Groups - Mathematical Physics - Emeritus.
Computer programs can be found on www.vortech.nl

Dr. ir.E.H.A. Vollebregt has all programs and can be mailed on edwin.vollebregt@vortech.nl