1. Olefin synthesis with organic phosphonate carbanions
2. M. Klaus et al, US Patent 5,700,836 (December 23, 1997)
3. H.-H. Wuest et al, US Patent 4,801,733 (January 31, 1989)
4. H. Riechers et al, US Patent 5,969,134 (October 19, 1999) and US Patent 5,932,730 (August 3, 1999)
5. D. Klinge et al, US Patent 6,686,369 (February 3, 2004)