Modulation transfer in Doppler broadened Λ system and its application to frequency offset lockingY. B. Kale, A. Ray, N. Singh, Q. V. Lawande and B. N. JagatapEur. Phys. J. D, 61 1 (2011) 221-229DOI: https://doi.org/10.1140/epjd/e2010-10220-2