Wartanjan; Tosunjan Izvestiya Akademii Nauk Armyanskoi SSR, Khimicheskie Nauki, 1957 , vol. 10, p. 195,198 Izvestiya Akademii Nauk Armyanskoi SSR, Khimicheskie Nauki, 1958 , vol. 11, p. 177,178,179 Chem.Abstr., 1958 , p. 7120,1959 3047