@article{MAN_1965__158_161257,
     author = {W.G. BROWN},
     title = {On the {Existence} of {Square} {Roots} in certain {Rings} of {Power} {Series.}},
     journal = {Mathematische Annalen},
     pages = {82--89},
     publisher = {mathdoc},
     volume = {158},
     year = {1965},
     zbl = {0136.02503},
     url = {http://geodesic.mathdoc.fr/item/MAN_1965__158_161257/}
}