1. Abramowitz M, Stegun IA (1964) Handbook of mathematical functions, NBS AMS - 55
2. NIST Handbook of mathematical functions. Cambridge University Press, 2010
3. Achieser NI (1967) Theory of approximation. Ungar, New York
4. Birkhoff G, Varga RS, Young DM (1962) Alternating direction implicit methods. Advances in computers, vol 3. Academic, New York, pp 189–273
5. Cauer W (1958) Synthesis of linear communication networks. McGraw-Hill, New York