@article{MS2_1959__7_165699,
     author = {Vidar Thom\'ee},
     title = {Locally {Cogent} {Boundary} {Operators.}},
     journal = {Mathematica Scandinavica},
     pages = {5--32},
     publisher = {mathdoc},
     volume = {7},
     year = {1959},
     zbl = {0137.30103},
     url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165699/}
}