@article{NUMA_1979__32_132600,
     author = {A. Spence},
     title = {Error {Bounds} and {Estimates} for {Eigenvalues} of {Integral} {Equations.} {II.}},
     journal = {Numerische Mathematik},
     pages = {139--146},
     publisher = {mathdoc},
     volume = {32},
     year = {1979},
     zbl = {0387.65078},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1979__32_132600/}
}