High-contrast dark resonance on the D2-line of 87Rb in a vapor cell with different directions of the pump-probe wavesG. Kazakov, I. Mazets, Yu. Rozhdestvensky, G. Mileti, J. Delporte and B. MatisovEur. Phys. J. D, 35 3 (2005) 445-448DOI: https://doi.org/10.1140/epjd/e2005-00213-7