@article{MAN_1963__149_161009,
     author = {J.J. Sch\"affer},
     title = {Linear {Differential} {Equations} and {Functional} {Analysis.} {VII.} {Equations} on (? ..., + ...).},
     journal = {Mathematische Annalen},
     pages = {1--32},
     publisher = {mathdoc},
     volume = {149},
     year = {1963},
     zbl = {0106.29101},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__149_161009/}
}