Michailow; Powarow Zhurnal Obshchei Khimii, 1959 , vol. 29, p. 2079,2081;engl.Ausg.S.2048,2050 Full Text Show Details Nasarow et al. Zhurnal Obshchei Khimii, 1959 , vol. 29, p. 3683,3686;engl.Ausg.S.3641,3644 Full Text Show Details Ruhrchemie A. G. Patent: DE1019090 , 1955 ;