@article{MAN_1986__274_164101,
     author = {Heinz Leutwiler and Sirkka-Liisa Eriksson},
     title = {A {Potential-Theoretic} {Approach} to {Parallel} {Addition.}},
     journal = {Mathematische Annalen},
     pages = {301--318},
     publisher = {mathdoc},
     volume = {274},
     year = {1986},
     zbl = {0571.31005},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164101/}
}