TETRAHEDRON, vol. 58, no. 44, page. 9019 - 9028, 2002-10-28
SYNTHESIS-STUTTGART, no. 14, page. 2191 - 2202, 2001-11
TETRAHEDRON LETTERS, vol. 41, no. 31, page. 5917 - 5921, 2000-07-29
TETRAHEDRON LETTERS, vol. 41, no. 21, page. 4177 - 4180, 2000-05-29