Volume 7: Issue 1
Volume 7: Issue 2
Volume 7: Issue 3
Volume 6: Issue 1
Volume 6: Issue 2
Volume 5: Issue 1
Volume 5: Issue 2
Dobromir D. Enchev, Editor
ISSN 2367-5144
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Until 2014 ISSN 1311-834X
From 2014 ISSN 2367-5144
SPECIAL ISSUE
Dedicated to our colleague and friend Prof. Valerij Christov on the occasion of his 60th anniversary.
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From 2014 ISSN 1311-834X
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