1. L. J. Allen, N. J. McGurk, S. Sofianos and H. Fiedeldey, contributed paper VII-2, this conference.
2. V. F. Kharchenko and V. P. Levashev, contributed paper VII-14, this Conference.
3. B. F. Gibson and D. R. Lehman, contributed paper II-13, this conference.
4. Splines and variational methods;Prenter,1975
5. Analysis of the finite-element method;Strang,1973