@article {Russomanno2013,
	title = {Linear response as a singular limit for a periodically driven closed quantum system},
	journal = {Journal of Statistical Mechanics-theory and Experiment},
	year = {2013},
	month = {sep},
	pages = {P09012},
	doi = {10.1088/1742-5468/2013/09/P09012},
	author = {Russomanno, Angelo and Silva, Alessandro and Santoro, Giuseppe E.}
}
