@article {66597,
	title = {Real second order freeness and Haar orthogonal matrices},
	journal = {Journal of Mathematical PhysicsJournal of Mathematical Physics},
	volume = {54},
	year = {2013},
	month = {2013},
	pages = {051701},
	isbn = {0022-2488},
	author = {Mingo, James A and Popa, Mihai}
}
