1. GOST (State Standard) R ISO11146-1-2008: Lasers and Laser-Related Equipment. Test Methods for Laser Beam Widths, Divergence Angles and Beam Propagation Ratios. Part 1. Stigmatic and Simple Astigmatic Beams, 2008
2. GOST (State Standard) R ISO11146-2-2008: Lasers and Laser-Related Equipment. Test Methods for Laser Beam Widths, Divergence Angles and Beam Propagation Ratios. Part 2. General Astigmatic Beams, 2008.
3. GOST (State Standard) R/TR ISO11146-3-2008: Lasers and Laser-Related Equipment. Test Methods for Laser Beam Widths, Divergence Angles and Beam Propagation Ratios. Part 3. Intrinsic and Geometrical Laser Beam Classification, Propagation and Details of Test Methods, 2008.
4. Casey, H.C., and Panish, M.B., Heterostructure Lasers, 2 vols., Academic Press, 1978.
5. Thompson, G.H.B., Physics of Semiconductor Laser Devices, New York: J. Wiley and Sons, 1980, p. 185.