Velocity selective optical pumping and repumping effects with counter and copropagating laser radiations for D2 lines of rubidiumS. Chakrabarti, B. Ray and P. N. GhoshEur. Phys. J. D, 42 3 (2007) 359-368DOI: https://doi.org/10.1140/epjd/e2007-00038-4