no. R2
A Ritz method based on a complementary variational principle
Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 10 (1976) no. R2, pp. 39-48. 
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     author = {Falk, Richard S.},
     title = {A {Ritz} method based on a complementary variational principle},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Analyse num\'erique},
     pages = {39--48},
     publisher = {Dunod},
     address = {Paris},
     volume = {10},
     number = {R2},
     year = {1976},
     mrnumber = {433915},
     zbl = {0363.65084},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1976__10_2_39_0/}
}
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Falk, Richard S. A Ritz method based on a complementary variational principle. Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 10 (1976) no. R2, pp. 39-48. http://www.numdam.org/item/M2AN_1976__10_2_39_0/

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2. I. Babuska, Approximation by Hill Functions, Commentations Math. Univ. Carolinae, Vol. 11, 1970, p. 387-811. | MR | Zbl

3. I. Babuska, Approximation by Hill Functions, II, Technical Note BN-708, Institute for Fluid Dynamics and Applied Mathematics, University of Maryland, 1971.

4. I. Babuska, The Finite Element Method with Lagrangian Multipliers, Numer. Math. 20, 1973, p. 179-192. | MR | Zbl

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6. J. L. Lions, E. Magenes, Problèmes aux limites non homogènes et applications, Vol. 1, Paris, Dunod, 1968. | MR | Zbl

7. G. Strang and G. Fix, An Analysis of the Finite Element Method, Prentice Hall, Englewood Cliffs, N.J., 1973. | MR | Zbl