参考文献

Monsanto Chem.Co. Patent: US2752392 , 1952 ; Full Text Show Details Monsanto Chem.Co. Patent: US2852550 , 1956 ; Full Text Show Details Kabatschnik et al. Zhurnal Obshchei Khimii, 1959 , vol. 29, p. 2182,2189;engl.Ausg.S.2149,2155