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: 1660  |  Total: 2573
 1-5
 26-03-2014
 Unique: 5697  |  Total: 9159
 49-65
 14-03-2012
 Unique: 13161  |  Total: 18397
 1-10