Text in book Pesce, Mark. – «Ontos, eros, noos, logos». – Actes : 6e symposium des arts électroniques = Proceedings : 6th international symposium on electronic art. – Montréal : ISEA : Inter-Société des arts électroniques, [1995]. – P. 229-231.
Text in periodical Gillette, Frank. – «Random notes on the special case or (loop-de-loop)». – Radical Software. – Vol. 1, no. 1 [(1970)]. – P. 6. Also available on the Internet. {{www.radicalsoftware.org}}