| Reference |
W.E. van der Veer, R.J.J. van Diest and H.B. van Linden van den Heuvell: Experiments on light amplification without population inversion in a three-level system In: 4th European Quantum Electronics Conference and 7th Italian Conference on Quantum Electronics, September 10-13, 1993, Firenze, Italy : Technical Digest ; vol. II /ed. P. De Natale, R. Meucci and S. Pelli, European Physica Society, 1993. - pp. 611-614 |
