Martinez, Roberte; Velasco, Micaela; Martinez, Ignacio; Menconi, Italo; Ramirez, Alberto; Angeles, Enrique; Regla, Ignacio; Lopez, Rafael
Journal of Heterocyclic Chemistry, 1997 , vol. 34, # 6 p. 1865 - 1866

Fujitsu, Hiroshi; Shirahama, Shinichi; Matsumura, Eiichi; Takeshita, Kenjiro; Mochida, Isao
Journal of Organic Chemistry, 1981 , vol. 46, # 11 p. 2287 - 2290