TETRAHEDRON, vol. 49, no. 2, page. 293 - 318, 1993-01-08
TETRAHEDRON-ASYMMETRY, vol. 2, no. 12, page. 1359 - 1370, 1991-01
TETRAHEDRON-ASYMMETRY, vol. 2, no. 1, page. 27 - 30, 1991-01