Journal of the American Chemical Society, , vol. 27, p. 653

Bioorganic and Medicinal Chemistry Letters, , vol. 20, # 11 p. 3235 - 3239

Osborn et al.
Journal of the Chemical Society, 1956 , p. 4191,4205

Wu, Frank; Buettner, Frank H.; Chen, Rhonda; Hickey, Eugene; Jakes, Scott; Kaplita, Paul; Kashem, Mohammed A.; Kerr, Steven; Kugler, Stanley; Paw, Zofia; Prokopowicz, Anthony; Shih, Cheng-Kon; Snow, Roger; Young, Erick; Cywin, Charles L.
Bioorganic and Medicinal Chemistry Letters, 2010 , vol. 20, # 11 p. 3235 - 3239

Baker et al.
Journal of Organic Chemistry, 1952 , vol. 17, p. 149,153