@article{MASLO_2007__57_3_a2, author = {Darafsheh, M. R. and Sharifi, H.}, title = {Some results on $\Bbb Q$-groups}, journal = {Mathematica slovaca}, pages = {[219]}, publisher = {mathdoc}, volume = {57}, number = {3}, year = {2007}, mrnumber = {2357820}, zbl = {1184.20008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_2007__57_3_a2/} }