1. de Bruijn, N.G.: Asymptotic Methods in Analysis. New York: Dover 1981 (Reprint)
2. Cassels, J.W.S.: An Introduction to the Geometry of Numbers. Berlin Heidelberg New York: Springer 1959
3. Conway, J.H., Sloane, N.J.A.: Sphere Packings, Lattices and Groups. Berlin Heidelberg New York: Springer 1987
4. Pitman Monograph;P. Erdös,1989
5. Gradshteyn, I.S., Ryzhik, I.M.: Table of Integrals, Series and Products. New York: Academic Press 1980 (Translated from Russian)