NATURE, vol. 404, no. 6781, page. 982 - 986, 2000-04-27
TETRAHEDRON LETTERS, vol. 42, no. 14, page. 2709 - 2711, 2001-04-02
TETRAHEDRON LETTERS, vol. 42, no. 25, page. 4279 - 4279, 2001-06-18
TETRAHEDRON LETTERS, vol. 41, no. 4, page. 471 - 475, 2000-01-22