%0 Journal Article %A Gorelic, Isaac %T Orders of π-Bases %J Canadian mathematical bulletin %D 2010 %P 286-294 %V 53 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-036-5/ %R 10.4153/CMB-2010-036-5 %F 10_4153_CMB_2010_036_5