@article{MZ_1986__192_173709,
     author = {Arthur Steinberg},
     title = {On {Roots} of ak bl.},
     journal = {Mathematische Zeitschrift},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {192},
     year = {1986},
     zbl = {0569.20025},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__192_173709/}
}