Gulia Sax, Viktor Korchnoi, Sergey Dolmatov and Artur Yusupov. Candidates tournament 1990-1993. Along Hoogovens Tournament, January 1991
Fotoburo De Boer
<a rel="nofollow" class="external text" href="https://hdl.handle.net/21.12102/098b4b95-becb-8b17-18ef-8deff5b3350d">Noord-Hollands Archief</a>, NL-HlmNHA 1478 33668K00 21