@article{paperid:1010581,
author = {Rajabzadeh Moghaddam, Mohammad Reza and Alireza Salemkarَ},
title = {Covering Pair of Nilpotent Groups},
journal = {Italian Journal of Pure and Applied Mathematics},
year = {2009},
number = {25},
month = {May},
issn = {1126-8042},
pages = {57--62},
			numpages = {5},
keywords = {Pair of groups; Schur multiplier; relative central extension;
covering pair.},
}