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Institute of Mathematics and InformaticsBulgarian Academy of Sciences
Department of Applied Mathematics and InformaticsTechnical University - Sofia
Acad. G. Bonchev Str. 81113 Sofia
IMI-BAS: +359-2-9793815,DAMI-TU: +359-2-9652496,Mobile: +359 896309735,Fax: +359 2 971 3649, Email: rkovach@math.bas.bg, r_kovacheva@facebook.com