On saddle point problems in the calculus of variations, the Ritz algorithm, and monotone convergence

Variational Methods for the Study of Nonlinear Operators

E. H. Rothe, M. M. Vaĭnberg, L. M. Kantorovich et al. · American Mathematical Monthly · 1966 · 842 citations

Natural Sciences, Mathematics, Computational Mechanics +12

Elements of Functional Analysis.

Robert G. Bartle, L. A. Lusternik, V. J. Sobolev et al. · American Mathematical Monthly · 1962 · 346 citations

Law, Mathematics, Systems Analysis +3

Applications of the theory of quadratic forms in Hilbert space to the calculus of variations

Magnus R. Hestenes · Pacific Journal of Mathematics · 1951 · 207 citations · Full text

Natural Sciences, Mathematics, Applied Mathematics +10

Application of a lemma on bilinear forms to a problem in nonlinear oscillations

A. C. Lazer · Proceedings of the American Mathematical Society · 1972 · 84 citations · Full text

Natural Sciences, Mathematics, Differential Equations +15

Linear eigenvalues and a nonlinear boundary value problem

Edward M. Landesman, A. C. Lazer · Pacific Journal of Mathematics · 1970 · 50 citations · Full text

Natural Sciences, Mathematics, Differential Equations +13