Khomko, Oleg Yosupovuch; Sydorchuk, Ruslan Ihorovuch; Piddubna, Polina Іvanivna; Sydorchuk, Oleh Ihorovuch; Kifiak, Petro Vasuliovuch; Voytkevich, Yuliya Ihorivna
(International scientific professional periodical journal "THE UNITY OF SCIENCE" / Vienna, Austria, March, 2017, P.49-51., 2017-03)