| Operations Research Department Institute of Mathematics and Informatics, BAS Akad. G. Bonchev str., block 8, office: 416, 504 1113 Sofia, Bulgaria Tel. (+359) 2 979 3850, 2 979 2850 E-mail: nkirov<at>math.bas.bg |
Department of Informatics New Bulgarian University 21 Montevideo str., Building 2, office: 611 II 1618 Sofia, Bulgaria Tel. (+359) 2 811 0611 E-mail: nkirov<at>nbu.bg |
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