TY - JOUR AU - Najzar, Karel TI - Error-estimates for the Ritz's method of finding eigenvalues and eigenfunctions JO - Commentationes Mathematicae Universitatis Carolinae PY - 1971 SP - 485 EP - 501 VL - 12 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a2/ LA - en ID - CMUC_1971__12_3_a2 ER -