1. V C Long, H N Viet, M Trippenbach and K D Xuan, Comput. Meth. Sci. Technol. 14, 1 (2008)
2. D V Valovik, J. Opt. 19, 115502 (2017)
3. R W Boyd, Nonlinear optics, 2nd Edn (Academic Press, 2003)
4. D L Mills, Nonlinear optics: Basic concepts (Springer, 1991)
5. Y R Shen, The principles of nonlinear optics (Wiley, New York, 1984)