Klitzke, Clecio Fernando; Pilli, Ronaldo Aloise
Tetrahedron Letters, 2001 , vol. 42, # 33 p. 5605 - 5608

El-Nezhawy, Ahmed O. H.; El-Diwani, Hoda I.; Schmidt, Richard R.
European Journal of Organic Chemistry, 2002 , # 24 p. 4137 - 4142