@article{paperid:1026358,
author = {Erfanian, Ahmad and Francesco Russo and N. H. Sarmin},
title = {SOME CONSIDERATIONS ON THE NONABELIAN TENSOR SQUARE OF CRYSTALLOGRAPHIC GROUPS},
journal = {Asian-European Journal of Mathematics},
year = {2011},
volume = {04},
number = {2},
month = {June},
issn = {1793-5571},
pages = {271--282},
			numpages = {11},
keywords = {Schur multiplier; polycyclic groups; pro–p–groups of finite co-
class; Bieberbach groups.},
}