Schweiger Manuela, Seidel S. Russell, Arif Atta M., Stang Peter J.
Department of Chemistry University of Utah 315 S. 1400 E. RM 2020 Salt Lake City, Utah 84112 (USA).
Angew Chem Int Ed Engl. 2001 Sep 17;40(18):3467-3469. doi: 10.1002/1521-3773(20010917)40:18<3467::aid-anie3467>3.0.co;2-4.