@article{10_4153_CMB_2010_036_5,
     author = {Gorelic, Isaac},
     title = {Orders of {\ensuremath{\pi}-Bases}},
     journal = {Canadian mathematical bulletin},
     pages = {286--294},
     year = {2010},
     volume = {53},
     number = {2},
     doi = {10.4153/CMB-2010-036-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-036-5/}
}