@article{CMUC_2012__53_4_a3,
     author = {Borkowski, Marcin and Ma\'ckowiak, Piotr},
     title = {Further remarks on formal power series},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {549--555},
     publisher = {mathdoc},
     volume = {53},
     number = {4},
     year = {2012},
     mrnumber = {3016425},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2012__53_4_a3/}
}