TETRAHEDRON LETTERS, vol. 33, no. 44, page. 6661 - 6664, 1992-10-27
TETRAHEDRON LETTERS, vol. 33, no. 45, page. 6811 - 6814, 1992-11-03
SYNLETT, no. 4, page. 306 - 308, 1992-04
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