@article{AM2_1987__33_137214,
     author = {C. Praagman},
     title = {Roots and logarithms of automorphisms of complete local rings.},
     journal = {Aequationes mathematicae},
     pages = {220--229},
     publisher = {mathdoc},
     volume = {33},
     year = {1987},
     zbl = {0646.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__33_137214/}
}