@article{ARM_1995__31_1_a5,
     author = {Rudolf, Boris},
     title = {The generalized boundary value problem is a {Fredholm} mapping of index zero},
     journal = {Archivum mathematicum},
     pages = {55--58},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1995},
     mrnumber = {1342375},
     zbl = {0830.34013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1995__31_1_a5/}
}