TETRAHEDRON LETTERS, vol. 37, no. 21, page. 3631 - 3634, 1996-05-20
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS, vol. 7, no. 6, page. 733 - 738, 1997-03-18
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS, vol. 9, no. 8, page. 1175 - 1178, 1999-04-19