@article {Simula.simula.3112,
	title = {Demand Response Management With Multiple Utility Companies: a Two-Level Game Approach},
	journal = {IEEE Transactions on Smart Grid},
	volume = {5},
	number = {2},
	year = {2014},
	author = {Chai, B. and Chen, J. and Yang, Z. and Zhang, Yan}
}
