1. Jean-Marc Bouclet. An introduction to pseudo-differential operators. Lecture Notes, Available at http://www.math.univ-toulouse.fr/˜bouclet, 2012.
2. Man-Wah Wong. Introduction To Pseudo-differential Operators, An, volume 6. World Scientific Publishing Company, 2014.
3. Product of two generalized pseudo-differential operators involving fractional Fourier transform
4. An n-dimensional pseudo-differential operator involving the Hankel transformation
5. Samuel Zaidman. Distributions and pseudo-differential operators, volume 248. Harlow, England: Longman Scientific & Technical, 1991.