Norris; Thorpe
Journal of the Chemical Society, 1921 , vol. 119, p. 1206
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Hirst; Macbeth
Journal of the Chemical Society, 1922 , vol. 121, p. 2175
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Vorlaender; Kohlmann
Justus Liebigs Annalen der Chemie, 1902 , vol. 322, p. 256