Foote,C.S.; Woodward,R.B.
Tetrahedron, 1964 , vol. 20, p. 687 - 715

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Chemische Berichte, 1934 , vol. 67, p. 2104,2107
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Justus Liebigs Annalen der Chemie, 1933 , vol. 505, p. 274,281
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Justus Liebigs Annalen der Chemie, 1936 , vol. 526, p. 103,112