Author

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

 21-06-2018
 Unique: 576  |  Total: 824
 1-8
 18-12-2012
 Unique: 3819  |  Total: 5090
 1-8
 30-01-2012
 Unique: 7729  |  Total: 9898
 1-13
 14-09-2011
 Unique: 6043  |  Total: 7226
 1-4
 01-11-2010
 Unique: 10711  |  Total: 12590
 1-14