Orlinski, Ryszard; Stankiewicz, Tomasz
Tetrahedron Letters, 1988 , vol. 29, # 13 p. 1601 - 1602

Cardellicchio, C.; Fiandanese, V.; Marchese, G.; Naso, F.; Ronzini, L.
Tetrahedron Letters, 1985 , vol. 26, # 36 p. 4387 - 4390