@article{NUMA_1989__56_2-3_133425,
     author = {Uday Banerjee and John E. Osborn},
     title = {Estimation of the {Effect} of {Numerical} {Integration} in {Finite} {Element} {Eigenvalue} {Approximation.}},
     journal = {Numerische Mathematik},
     pages = {735--762},
     publisher = {mathdoc},
     volume = {56},
     number = {2-3},
     year = {1989},
     zbl = {0693.65071},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__56_2-3_133425/}
}