Ablowitz, M. J., & Fokas, A. S. (2003). Complex variables: Introduction and applications (Second edition.). Cambridge University Press.

Ablowitz, Mark J., and A. S. Fokas. Complex Variables: Introduction and Applications. Second edition. Cambridge, UK ; New York: Cambridge University Press, 2003.

Ablowitz, Mark J., and A. S. Fokas. Complex Variables: Introduction and Applications. Second edition. Cambridge University Press, 2003.