1. IBM Patent Server, http://www.patents.ibm.com.
2. Electrochromism;Monk,1995
3. B. Warzawski, US Pat. 4,538,158, 1985.
4. B. Warzawski, Alpine Polyvision Inc. US Pat. 5,078,480, 1992.
5. B. Eid, P. Marque, J. Themont, Corning Inc. US Pat. 5,210,638, 1993.