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Shustareva, T. K.; Druzhinina, V. E.
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Khimiya Geterotsiklicheskikh Soedinenii, 1986 , vol. 22, # 1 p. 34 - 39

Arcoria, Antonino; Ballistreri, Francesco P.; Spina, Emanuela; Tomaselli, Gaetano A.; Maccarone, Emanuele
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1988 , p. 1793 - 1798