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- HOÁNG, Chinh T. On the Sibling - Structure of Perfect Graphs. 1. ed. Bonn : Institut für Ökonometrie und Operations Research, 1990. 4 s. Report, No.90644 - OR. [Copy count : 1, currently available 1, at library only 0]
- HOÁNG, Chinh T. A Parallel Algorithm for Minimum Weigted Colouring of Triangulated Graphs. 1. ed. Bonn : Institut für Ökonometrie und Operations Research, 1990. 11 s. Report, No.90645-OR. [Copy count : 1, currently available 1, at library only 0]