@article {852,
	title = {Properties of real and complex ETFs and their application to the design of low coherence frames},
	journal = {Linear Algebra and its Applications},
	volume = {508},
	year = {2016},
	month = {November, 2016},
	pages = {81-90},
	url = {http://www.sciencedirect.com/science/article/pii/S0024379516302555},
	author = {Cristian Rusu and Nuria Gonz{\'a}lez-Prelcic and Robert W. Heath Jr.}
}
