Effect of spontaneously generated coherence on the dynamics of a four level N-systemNiharika Singh, Richard D’Souza, Quissen V. Lawande and Bhagawantrao Narasin JagatapEur. Phys. J. D, 67 7 (2013) 147DOI: https://doi.org/10.1140/epjd/e2013-40280-5