1. New developments in laser resonators, in Optical Resonators;Siegman;Proc. SPIE,1990
2. Defining, measuring, and optimizing laser beam quality;Siegman;Proc. SPIE,1993
3. Terminology and Test Methods ISO/TC172/SC/WG1,1991
4. ISO 11146-1 Lasers and Laser-Related Equipment—Test Methods for Laser Beam Widths, Divergence Angles and Beam Propagation Ratios—Part 1: Stigmatic and Simple Astigmatic Beams,2005
5. ISO 11146-2, Lasers and Laser-Related Equipment—Test Methods for Laser Beam Widths, Divergence Angles and Beam Propagation Ratios—Part 2: General Astigmatic Beams,2005