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THE ENERGY PROBLEM AS THE BASIS FOR ALTERNATIVE ENERGY SOUR..:

Mollov,, Jordan Atanasov
https://www.scilook.eu/index.php/slif/article/view/slif08-02-030/pdf08-02-030.  , 2018
Link: https://www.scilook.eu/index.php/slif/article/view/sli..