@article{10_4153_CJM_1968_048_2,
     author = {Barnes, Bruce Alan},
     title = {A {Generalized} {Fredholm} {Theory} for {Certain} {Maps} in the {Regular} {Representations} of an {Algebra}},
     journal = {Canadian journal of mathematics},
     pages = {495--504},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-048-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-048-2/}
}