Sarkisyan, D., Becker, T., Papoyan, A., Thoumany, P., & Walther, H. (2003). Sub-Doppler fluorescence on the atomic D-2 line of a submicron rubidium-vapor layer. Applied Physics B-Lasers and Optics, 76(6), 625-631. Retrieved from http://www.springerlink.com/link.asp?id=vyelpp961lbrtemc.