Tetrahedron Letters, , vol. 27, # 20 p. 2247 - 2250

Levy, Jack B.; Walton, Richard C.; Olsen, Ron E.; Symmes Jr., Courtland
Phosphorus, Sulfur and Silicon and Related Elements, 1996 , vol. 109, # 1-4 p. 545 - 548

Levy, Jack B.; Walton, Richard C.; Olsen, Ron E.; Symmes Jr., Courtland
Phosphorus, Sulfur and Silicon and Related Elements, 1996 , vol. 109, # 1-4 p. 545 - 548