Salmi; Kyrki
Suomen Kemistilehti B, 1946 , vol. 19, p. 97,100
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Fieser et al.
Journal of Biological Chemistry, 1944 , vol. 156, p. 191,195

Sainz-Diaz
Monatshefte fur Chemie, 2002 , vol. 133, # 1 p. 9 - 22