@article{Casablanca_2011,
title={Toughness of the corona of two graphs},
volume={88},
ISSN={1029-0265},
url={http://dx.doi.org/10.1080/00207160.2011.564277},
DOI={10.1080/00207160.2011.564277},
number={13},
journal={International Journal of Computer Mathematics},
publisher={Informa UK Limited},
author={Casablanca,
R. M. and Diánez,
A. and García-Vázquez,
P.},
year={2011},
month=sep,
pages={2697–2706} }