18.03.2018. The journal's editor retracted the article in accordance with the author’s application and the results of further investigation of the article in the aspect of borrowing ethics by the following reasons: not all the authors of the article have been indicated, there was abuse of I.R. Saitbattalov’s author rights, the materials of I.R. Saitbattalov’s dissertation have been used in the article in the form of direct copying of text fragments without indicating the authentic source in the reference list.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the authors’ articles. The authors have been informed about the retraction and have given their consent. 

May, 17, 2018: The article retracted by reason of duplicating 100 % of the author’s article. The author has been informed about the retraction and has given her consent.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the author’s articles. The author has been informed about the retraction and has given her consent.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the author’s article. The author has been informed about the retraction and has given her consent.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the author’s article. The author has been informed about the retraction and has given her consent.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the authors’ article. The authors have been informed about the retraction and have given their consent.

May, 17, 2018: The article retracted by reason of duplicating 100 % of the author’s article. The author has been informed about the retraction and has given her consent.