@article{AM2_1985__29_137080,
     author = {J. Schwaiger},
     title = {Roots of formal power series in one variable.},
     journal = {Aequationes mathematicae},
     pages = {40--43},
     publisher = {mathdoc},
     volume = {29},
     year = {1985},
     zbl = {0578.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137080/}
}