JOURNAL OF ORGANIC CHEMISTRY, vol. 64, no. 14, page. 5036 - 5041, 1999-07-09
JOURNAL OF ORGANIC CHEMISTRY, vol. 64, no. 21, page. 8048 - 8050, 1999-10-15
JOURNAL OF ORGANIC CHEMISTRY, vol. 62, no. 12, page. 4068 - 4071, 1997-06-13