1. O.C. Zienkiewicz:The Finite Element Method, 3rd. edition, McGraw-Hill, 1977.
2. G. Strang and G. J. Fix:An Analysis of the Finite Element Method, Prentice-Hall, Englewood Cliffs, NJ, 1973.
3. K.H. Huebner:The Finite Element Method for Engineers, John Wiley & Sons, 1975.
4. J. M. Alexander and H. W. H. Price:Proc. 18th Int. Conf. Mach. Tool Dzes. Res., 1977, pp. 267–74.
5. K. Osakada:4th Int. Conf. Prod. Eng., Tokyo, 1980, p. 44.