@article{MAN_1984__269_163928,
     author = {S.M. Salamon},
     title = {Harmonic {4-Spaces.}},
     journal = {Mathematische Annalen},
     pages = {169--178},
     publisher = {mathdoc},
     volume = {269},
     year = {1984},
     zbl = {0562.53014},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__269_163928/}
}