参考文献

Staley Mfg. Co. Patent:   US2493375 , 1946 ;           Lukes; Syhora Collection of Czechoslovak Chemical Communications, 1954 ,  vol. 19, p. 1205,1209           Staley Mfg. Co. Patent:   US2493374 , 1946 ;           Syhora Collection of Czechoslovak Chemical Communications, 1961 ,  vol. 26, p. 2058