Հոդված 588 T.Ghochikyan M.Samvelyan V.Harutyunyan E.Harutyunyan A.Petrosyan P.Langer ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 71(3)b 267-271 2016 http://www.degruyter.com/view/j/znb