參考文獻:
Sevenard, Dmitri V. Vorobyev, Mikhail Sosnovskikh, Vyacheslav Ya. Wessel, Helma Kazakova, Olesya Vogel, Vera Shevchenko, Nikolay E. Nenajdenko, Valentine G. Lork, Enno Roeschenthaler, Gerd-Volker Tetrahedron, 2009 , vol. 65, # 36 p. 7538 - 7552