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/21.12102/32489c21-1d32-da80-1f4d-f9ad2c1e0569">Noord-Hollands Archief</a>, NL-HlmNHA 1478 33688K00 12