Smith
Journal of the Chemical Society, 1944 , p. 633,636
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Sutter; Reichstein
Helvetica Chimica Acta, 1938 , vol. 21, p. 1210,1216
Mai
Zhurnal Obshchei Khimii, 1957 , vol. 27, p. 3192,3194; engl. Ausg. S. 3228, 3229
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Mai
Zhurnal Obshchei Khimii, 1961 , vol. 31, p. 2640;engl.Ausg.S.2465