Coherent population trapping and strong electromagnetically induced transparency resonances on the D1 line of potassiumS. Gozzini, S. Cartaleva, A. Lucchesini, C. Marinelli, L. Marmugi, D. Slavov and T. KaraulanovEur. Phys. J. D, 53 2 (2009) 153-161DOI: https://doi.org/10.1140/epjd/e2009-00126-5