@article{GDZPPN001174096, title = {Error Bounds and Estimates for Eigenvalues of Integral Equations.}, journal = {Numerische Mathematik}, volume = {28}, year = {1977}, pages = {133-148}, zbl = {0358.65109}, url = {http://dml.mathdoc.fr/item/GDZPPN001174096} }
Spence, A. Error Bounds and Estimates for Eigenvalues of Integral Equations.. Numerische Mathematik, Tome 28 (1977) pp. 133-148. http://gdmltest.u-ga.fr/item/GDZPPN001174096/