@article{paperid:1006584, author = {Mashayekhy Fard, Behrooz and -, -}, title = {On polynilpotent covering groups of a polynilpotent group}, journal = {International Journal of Mathematics, Game Theory and Algebra}, year = {2006}, month = {March}, issn = {1060-9881}, keywords = {$\\\\\\\\\\\\\\\\cal V$-covering group; polynilpotent groups; solvable-group.}, }