1. De Re Metallica;Agricola,1556
2. Optical microemission stimulated by a ruby maser;Brech;Appl. Spectrosc.,1962
3. Quantum cascade lasers in chemical physics;Curl;Chem. Phys. Lett.,2010
4. Laser Spectroscopy: Vol. 1 Basic Principles Vol. 2 Experimental Techniques;Demtröder,2008
5. Stimulated optical radiation in ruby;Maiman;Nature,1960