1. Langlois, W. E., R. S. Rivlin Steady flow of slightly viscoelastic fluids. Technical Report No. DA-4725/3 (Division of Applied Mathematics, Brown University, Providence, R. I., 1959).
2. Coleman, B. D., W. Noll Arch. Rational Mech. Anal.6, 355 (1960).
3. Olver, F. W. J. Handbook of Mathematical Functions,Abramowitz, M., I. A. Stegun (eds.): (U. S. Government Printing Office, Washington, D. C. 355, 1970).