@article{932161, author = {M.~D. Johnson and A. Loeb and H. Shiokawa and A.~A. Chael and S.~S. Doeleman}, title = {Measuring the Direction and Angular Velocity of a Black Hole Accretion Disk via Lagged Interferometric Covariance}, year = {2015}, journal = {ApJ}, volume = {813}, pages = {132}, month = {11/2015}, doi = {10.1088/0004-637X/813/2/132}, language = {eng}, }