Daniel, Sharon ; Bartlett, Mark ; Guhathakurta, Puragra. — «Subtract the sky : the aesthetics, science and philosophy of a collaborative system and its interactive interfaces». — Invenção : pensando o proximo milénio = pesando el pròximo milenio = thinking the next millenium. — São Paulo : Instituto Itaú Cultural ; Montréal : ISEA : Inter-Société des arts électroniques ; San Francisco : Leonardo ; Plymouth : CAiiA-STAR : Centre for Advanced Inquiry In the Interactive Arts, 1999. — N. p.