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: 43  |  Total: 51
 1-8
 18-12-2012
 Unique: 3598  |  Total: 4739
 1-8
 30-01-2012
 Unique: 7500  |  Total: 9406
 1-13
 14-09-2011
 Unique: 5860  |  Total: 6895
 1-4
 01-11-2010
 Unique: 10430  |  Total: 12010
 1-14