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- LOEBL, M. - POLJAK, S. Subgraph Packing : A Survey. 1. ed. Bonn : Inst. für Ökon. und Operations Research, 1989. 13 s. Report, No.89599-OR. [Copy count : 1, currently available 1, at library only 0]
- CRAMA, Y. - LOEBL, M. - POLJAK, S. A Decomposition of Strongly Unimodular Matrices into Incidence Matrices of Digraphs. 1. ed. Bonn : Inst. für Ökon. und Operations Research, 1989. 6 s. Report, No.89611-OR. [Copy count : 1, currently available 1, at library only 0]