Unelius, C. Rikard; Eiras, Alvaro; Witzgall, Peter; Bengtsson, Marie; Kovaleski, Adalecio; Vilela, Evaldo F.; Borg-Karlson, Anna-Karin
Tetrahedron Letters, 1996 , vol. 37, # 9 p. 1505 - 1508