Author

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Lyubomir Penev
Pensoft Publishers & Bulgarian Academy of Sciences, Sofia, Bulgaria
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3 articles by this author

 13-04-2016
 Unique: 1799  |  Total: 2836
 1-5
 26-03-2014
 Unique: 5906  |  Total: 9698
 49-65
 14-03-2012
 Unique: 13401  |  Total: 18913
 1-10