Schmid, Christopher R.; Sluka, James P.; Duke, Kristin M.
Tetrahedron Letters, 1999 , vol. 40, # 4 p. 675 - 678

Bradley, David A.; Godfrey, Alexander G.; Schmid, Christopher R.
Tetrahedron Letters, 1999 , vol. 40, # 28 p. 5155 - 5159