@article{NUMA_1982__38_132749,
     author = {C.I. Goldstein},
     title = {The {Finite} {Element} {Method} with {Non-Uniform} {Mesh} {Sizes} {Applied} to the {Exterior} {Helmholtz} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {61--82},
     publisher = {mathdoc},
     volume = {38},
     year = {1982},
     zbl = {0445.65102},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__38_132749/}
}