Abele; Rubina; Sleiksha; Lukevics
Chemistry of Heterocyclic Compounds, 1999 , vol. 35, # 9 p. 1052 - 1058

Pu, Yu-Ming; Christesen, Alan; Ku, Yi-Yin
Tetrahedron Letters, 2010 , vol. 51, # 2 p. 418 - 421

Wyeth
Patent: US2003/32645 A1, 2003 ;
US 20030032645 A1

Bellale, Eknath V.; Chaudhari, Mahesh K.; Akamanchi, Krishnacharya G.
Synthesis, 2009 , # 19 p. 3211 - 3213

Kartsev, V. G.; Pokidova, T. S.; Dovgilevich, A. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 5 p. 505 - 508
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, # 5 p. 632 - 634