J.O. Robertson [and four others]. Paul Brest [and four others] by A. P. Robertson and Wendy Robertson. Dinh Thai Hoang [and four others]. Ioan D. Marinescu [and four others]. Klaus Bengler [and four others]. 虞文武... [and four others]. 黄建滨 ... [and four others]. Jack C. Robertson, Timothy J. Louwers. by R. V. Ambartsumyan [and others.