@article{MZ_1976__147_172342,
     author = {Wolfhard Hansen},
     title = {Some {Remarks} on {Strict} {Potentials.}},
     journal = {Mathematische Zeitschrift},
     pages = {279--286},
     publisher = {mathdoc},
     volume = {147},
     year = {1976},
     zbl = {0306.31010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__147_172342/}
}