Hallstroem, G.; Lindeke, B.; Khuthier, A. H.; Al-Iraqi, M. A.
Tetrahedron Letters, 1980 , vol. 21, p. 667 - 670

Hill, Anthony W.; Elsegood, Mark R. J.; Kimber, Marc C.
Journal of Organic Chemistry, 2010 , vol. 75, # 15 p. 5406 - 5409