Fichera, G. Abstract unilateral problems. (English) Zbl 0264.49007 Conf. Theory ordinary partial diff. Equ., Dundee/Scotland 1972, Lect. Notes Math. 280, 51-64 (1972). MSC: 49J27 PDF BibTeX XML OpenURL
Fichera, Gaetano Further developments in the approximation theory of eigenvalues. (English) Zbl 0254.35092 Numerical Solution partial diff. Equations II, Proc. 2nd Sympos. numerical Solution partial diff. Equations, SYNSPADE 1970, Univ. Maryland, 243-252 (1971). MSC: 35P15 65N25 PDF BibTeX XML OpenURL
Fichera, G. Approximation and estimates for eigenvalues. (English) Zbl 0173.16702 Numer. Solution partial diff. Equations, Proc. Sympos. Univ. Maryland 1965, 317-352 (1966). PDF BibTeX XML OpenURL