@book{Arfken_Weber_Harris_2012, address={San Diego}, edition={7th edition}, title={Mathematical Methods for Physicists}, publisher={Elsevier Science Publishing Co Inc}, author={Arfken, George B. and Weber, Hans J. and Harris, Frank E.}, year={2012} }
@book{Riley_Hobson_Bence_2006, address={Cambridge}, edition={3rd Revised edition}, title={Mathematical Methods for Physics and Engineering}, publisher={Cambridge University Press}, author={Riley, K. F. and Hobson, M. P. and Bence, Stephen J.}, year={2006} }