TETRAHEDRON LETTERS, vol. 47, no. 40, page. 7153 - 7156, 2006-10-02
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 129, no. 16, page. 5244 - 5247, 2007-04-25
TETRAHEDRON, vol. 63, no. 17, page. 3538 - 3547, 2007-04-23