TETRAHEDRON LETTERS, vol. 33, no. 45, page. 6811 - 6814, 1992-11-03
TETRAHEDRON LETTERS, vol. 36, no. 40, page. 7263 - 7266, 1995-10-02
TETRAHEDRON LETTERS, vol. 33, no. 4, page. 507 - 510, 1992-01-21
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