[1]ZhurnalObshcheiKhimii,1953,vol.23,p.493,502;engl.Ausg.S.511,518
[2]Patent:US2107379,1933,,
[3]Patent:US2066967,1933,,
[4]Patent:US2066966,1932,,
[5]Patent:US2107379,1932,,
[6]Patent:US2066968,1933,,
[1]ZhurnalObshcheiKhimii,1953,vol.23,p.493,502;engl.Ausg.S.511,518
[1]ZhurnalObshcheiKhimii,1953,vol.23,p.493,502;engl.Ausg.S.511,518
[2]Patent:US2066967,1933,
[1]Patent:US2066967,1933,
[1]ZhurnalObshcheiKhimii,1953,vol.23,p.493,502;engl.Ausg.S.511,518