@article {Guglielmi2014,
	title = {Null controllability in large time for the parabolic Grushin operator with singular potential},
	journal = {Springer INdAM Series},
	volume = {5},
	year = {2014},
	pages = {87-102},
	author = {Cannarsa, P. and Guglielmi, R.}
}
