@article{CMUC_2007__48_1_a2,
     author = {Ormes, Nicholas and Vojt\v{e}chovsk\'y, Petr},
     title = {Powers and alternative laws},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {25--40},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2007},
     mrnumber = {2338827},
     zbl = {1174.20343},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007__48_1_a2/}
}