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Dr. Lyubomir Penev
PENSOFT Publishers
Acad. G. Bonchev Str., Bl.6, 1113 Sofia, Bulgaria
Tel: +359-2-967-40-70 Mobile +359-888-451668
Fax: +359-2-967-40-71
E-mail: pensoft@mbox.infotel.bg or info@pensoft.net
Pensoft Online Bookshop:
http://www.pensoft.net
Moscow department of PENSOFT:
sgol@orc.ru