Jakowlew; Dorfman
Zhurnal Obshchei Khimii, 1954 , vol. 24, p. 1171,1173;engl.Ausg.S.1163,1165
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Jakowlew
Zhurnal Obshchei Khimii, 1954 , vol. 24, p. 983,986; engl. Ausg. S. 983, 986
Clemo; Perkin
Journal of the Chemical Society, 1924 , vol. 125, p. 1618
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Backeberg
Journal of the Chemical Society, 1933 , p. 618