1. Victory, P.; Borrell, J.I.; Vidal-Ferran, A.Heterocycles 1993,36, 769–776.
2. Victory, P.; Borell, J.I.; Castejón, P.; Martinez-Teipel, B.; Vidal-Ferran, A.An. Quim. 1993,89, 625–628.
3. Shestopalov, A.M.; Promonenkov, V.K.; Sharanin, Yu.A.; Rodinovskaya, L.A.; Sharanin, S.Yu.Zh. Org. Khim. 1984,20, 1517–1538.
4. von Nagi-Felsobuki.Chem. Aust. 1986,53, 80.
5. von Nagi-Felsobuki, E.I.Chem. Phys. Lett. 1988,127, 245–247.