Gloria I. Yranzo, José Elguero, Robert Flammang, Curt Wentrup
European Journal of Organic Chemistry
Volume 2001,
Issue 12,
pages 2209–2220
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http://onlinelibrary.wiley.com/doi/10.1002/1099-0690(200106)2001:12%3C2209::AID-EJOC2209%3E3.0.CO;2-X/pdf