I added a reference for J'adoubovic, although this could still use another reference or two.  A magazine reference contemporary with the incident as Bill suggests would be good.  This is an extremely well-known story, probably the biggest story at Sousse 1967 other than Fischer dropping out.  Unlike many such stories, it seems to be true and accurately reported.  The WP:BLP concerns are well-grounded, however, and this really needed a better reference.  The article as a whole is still largely unreferenced.  The only other ref given is Golombek, and Golombek has only a brief entry which does not support most of the claims in the article.