@article{NUMA_1969__13_131902,
     author = {J.H. BRAMBLE},
     title = {On the {Convergence} of {Difference} {Approximations} to {Weak} {Solutions} of {Dirichlet's} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {101--111},
     publisher = {mathdoc},
     volume = {13},
     year = {1969},
     zbl = {0196.17803},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131902/}
}