@article{RCM_1981__15_181704,
     author = {Alfonso Castro and Peter W. Bates},
     title = {Necessary {And} {Sufficient} {Conditions} {For} {Existence} {Of} {Solutions} {To} {Equations} {With} {Noninvertible} {Linear} {Part.}},
     journal = {Revista colombiana de matematicas},
     pages = {7--24},
     publisher = {mathdoc},
     volume = {15},
     year = {1981},
     zbl = {0473.47048},
     url = {http://geodesic.mathdoc.fr/item/RCM_1981__15_181704/}
}