Spencer, Thomas A.; Onofrey, Thomas J.; Cann, Reginald O.; Russel, Jonathon S.; Lee, Laura E.; Blanchard, Daniel E.; Castro, Alfredo; Gu, Peide; Jiang, Guojian; Shechter, Ishaiahu Journal of Organic Chemistry, 1999 , vol. 64, # 3 p. 807 - 818