1. A. Zangwill, Modern Electrodynamics (Cambridge University Press, 2013)
2. J.D. Jackson, Classical Electrodynamics (Wiley, 2007)
3. P.M. Morse, H. Feshbach, Methods of Theoretical Physics (McGraw-Hill, 1953)
4. O’Neil, Engineering Mathematics (Thomson, 2003)
5. M. Debnath, Linear Partial Differential Equations (Birkhauser ,2007)