@article{GDZPPN002025671,
title = {The Effect of Quadrature Errors in the Numerical Solution of Two-Dimensional Boundary Value Problems by Variational Techniques},
journal = {Aequationes mathematicae},
volume = {7},
year = {1971},
pages = {36-58},
zbl = {0233.65056},
url = {http://dml.mathdoc.fr/item/GDZPPN002025671}
}
HERBOLD, R.J.; VARGA, R.S. The Effect of Quadrature Errors in the Numerical Solution of Two-Dimensional Boundary Value Problems by Variational Techniques. Aequationes mathematicae, Tome 7 (1971) pp. 36-58. http://gdmltest.u-ga.fr/item/GDZPPN002025671/