@article {494, title = {Passive Detection of Correlated Subspace Signals in Two MIMO Channels}, journal = {IEEE Transactions on Signal Processing}, volume = {65}, year = {2017}, month = {October}, pages = {5266-5280}, doi = {10.1109/TSP.2017.2723340}, author = {Santamar{\'\i}a, Ignacio and Louis L. Scharf and V{\'\i}a, Javier and Wang, Yuan and Wang, Haonan} }