@article{MS2_1977__41_166566,
     author = {Arne Jensen},
     title = {Some remarks on eigenfunction expansions for {Schr\"odinger} operators with non-local potentials.},
     journal = {Mathematica Scandinavica},
     pages = {347--357},
     publisher = {mathdoc},
     volume = {41},
     year = {1977},
     zbl = {0372.47004},
     url = {http://geodesic.mathdoc.fr/item/MS2_1977__41_166566/}
}