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Budapest, MTA SZTAKI, 1993. 12 p. 186-93 KELLER, K.: Decisions of environmental impact assessment supported by WINGDSS, a group decision support system under MS-Windows. Working paper of the Laboratory of Operations Research and Decision Systems (LORDS) WP 93-4. Budapest, MTA SZTAKI, 1993. 17 p. 187-93 MAROS, I. -- LEVKOVITZ, R. -- MITRA, G.: Computational issues of integrating sparse simplex and interior point methods. In: Scandinavian workshop on linear programming. Copenhagen, 1993. Copenhagen, Technical University of Denmark, 1993. pp. 27-31. 188-93 MAROS, I. -- MÉSZÁROS, Cs.: A numerically exact implementation of the simplex method. In: APMOD93. Symposium on applied mathematical programming and modeling. Budapest, 1993. (Ed. I. Maros.) Budapest, Akaprint, 1993. pp. 403-409. 189-93 MAROS, I. -- MÉSZÁROS, Cs.: A numerically exact implementation of the simplex method. Working paper of the Laboratory of Operations Research and Decision Systems (LORDS) WP 93-10. 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