@article{10_1017_S0017089518000393,
     author = {BENJAMIN, RONALDA and LAUSTSEN, NIELS JAKOB and MOUTON, SONJA},
     title = {r-FREDHOLM {THEORY} {IN} {BANACH} {ALGEBRAS}},
     journal = {Glasgow mathematical journal},
     pages = {615--627},
     year = {2019},
     volume = {61},
     number = {3},
     doi = {10.1017/S0017089518000393},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089518000393/}
}