@article{paperid:1009487,
author = {Erfanian, Ahmad and فرخی},
title = {On Some Classes of Tidy Groups},
journal = {Algebras, Groups and  Geometries},
year = {2008},
volume = {25},
month = {January},
issn = {0741-9937},
pages = {109--114},
			numpages = {5},
keywords = {Tidy group; covering; relatively free group},
}