European Physica Society
P. De Natale , R. Meucci , S. Pelli

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