Forsythe, William et al. — Improvisation technologies : a tool for the analytical dance eye. — Karlsruhe : ZKM/Center for Art and Media Karlsruhe ; Köln : Deutschen Tanzarchivs, 1999. — 55 p. — (Digital arts edition ; special issue / Tanzdokumente digital no. 2). — Booklet accompanying a CD-ROM. — English and German text. — ISBN 3775708502.