Peters
Journal of the Chemical Society, 1959 , p. 1761,1765

Alder; Stein
Justus Liebigs Annalen der Chemie, 1934 , vol. 514, p. 1,25
Justus Liebigs Annalen der Chemie, 1936 , vol. 525, p. 183,194, 213
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Thiele
Chemische Berichte, 1901 , vol. 34, p. 70
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Peters
Journal of the Chemical Society, 1959 , p. 1761,1765