Johnson, Alan W.; Gowda, Gopala; Hassanali, Ahmed; Knox, John; Monaco, Sam; et al.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1981 , p. 1734 - 1743
Rubottom, George M.; Gruber, John M.; Marrero, Roberto; Juve, Henrik D.; Kim, Wan Chong
Journal of Organic Chemistry, 1983 , vol. 48, # 25 p. 4940 - 4944