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The Demographic Problem - one of the Main Problems of Contemporary


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Ivaylo Vladev
Konstantin Preslavsky University of Shumen, Faculty of Natural SciencesShumen, Bulgaria
Rositsa Vladeva
Konstantin Preslavsky University of Shumen, Faculty of Natural SciencesShumen, Bulgaria
eISSN:
2367-5144
Language:
English
Publication timeframe:
Volume Open
Journal Subjects:
Chemistry, other, Geosciences, Geography, Life Sciences, Physics