@article{CMUC_2013_54_2_a11,
     author = {Megrelishvili, Michael and Shlossberg, Menachem},
     title = {Free non-archimedean topological groups},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {273--312},
     year = {2013},
     volume = {54},
     number = {2},
     mrnumber = {3067710},
     zbl = {06221269},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2013_54_2_a11/}
}