Authors

Mohamed Brahimi        

University of Chlef, Chlef, Algeria

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Stanley Brunn    

University of Kentucky, Lexington, United States of America

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Georgi Burdarov        

Sofia University "St. Kliment Ohridski", Sofia, Bulgaria

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Milen Chanev            

Space Research and Technology Institute Bulgarian academy of Sciences, Sofia, Bulgaria

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Zornitza Cholakova                

Sofia University "St. Kliment Ohridski", Sofia, Bulgaria

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Siya Cholakova            

Sofia University "St. Kliment Ohridski", Sofia, Bulgaria

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Stelian Dimitrov            

Sofia University "St. Kliment Ohridski", Sofia, Bulgaria

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Neno Dimov

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Adelina Dimova

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