@article{MAN_1981__257_163552,
     author = {Wolfgang Meier},
     title = {Charakterisierung von {Produkten} harmonischer {R\"aume.}},
     journal = {Mathematische Annalen},
     pages = {199--218},
     publisher = {mathdoc},
     volume = {257},
     year = {1981},
     zbl = {0449.31010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__257_163552/}
}