@article{PORMA_1985__43_1_114549,
     author = {d'Almeida, Filomena Dias},
     title = {Perturbation series and defect correction for the refinement of approximate eigenelements of linear integral operators},
     journal = {Portugaliae mathematica},
     pages = {93--103},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1985},
     mrnumber = {0875056},
     zbl = {0612.65094},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114549/}
}