TY - JOUR AU - R.J. HERBOLD AU - R.S. VARGA TI - The Effect of Quadrature Errors in the Numerical Solution of Two-Dimensional Boundary Value Problems by Variational Techniques JO - Aequationes mathematicae PY - 1971 SP - 36 EP - 58 VL - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1971__7_136220/ ID - AM2_1971__7_136220 ER -