Observation of ultra-narrow electromagnetically induced transparency and slow light using purely electronic spins in a hot atomic vaporF. Goldfarb, J. Ghosh, M. David, J. Ruggiero, T. Chanelière, J.-L. Le Gouët, H. Gilles, R. Ghosh and F. BretenakerEPL, 82 5 (2008) 54002DOI: https://doi.org/10.1209/0295-5075/82/54002