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http://www.sciencedirect.com/science/article/pii/003040189390757V/pdf?md5=41a39e308a160a6f512176b26db99242&pid=1-s2.0-003040189390757V-main.pdf (Publisher version)
Grimm, R., Söding, J., Ovchinnikov, Y. B., & Sidorov, A. I. (1993). Sub-Doppler manifestation of the magneto-optical radiation force. Optics Communications, 98(1-3), 54-60. doi:10.1016/0030-4018(93)90757-V.