TETRAHEDRON LETTERS, vol. 37, no. 34, page. 6137 - 6140, 1996-08-19
JOURNAL OF ORGANIC CHEMISTRY, vol. 61, no. 15, page. 4937 - 4943, 1996-07-26
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, vol. 17, no. 2, page. 153 - 158, 1996-02-20