Takeuchi, Naoki; Okada, Naomi; Tobinaga, Seisho
Chemical & Pharmaceutical Bulletin, 1983 , vol. 31, # 12 p. 4355 - 4359

Chen, Yuhpyng Liang; Mariano, Patrick S.; Little, Garrick M.; O'Brien, Daniel; Huesmann, Peter L.
Journal of Organic Chemistry, 1981 , vol. 46, # 23 p. 4643 - 4654