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/21.12102/47d4b50b-7be1-2efc-43e8-e6e59510387c">Noord-Hollands Archief</a>, NL-HlmNHA 1478 33664K00 27