Drupal-Bibcite0<style face="normal" font="default" size="100%">Measuring the Direction and Angular Velocity of a Black Hole Accretion Disk via Lagged Interferometric Covariance</style><style face="normal" font="default" size="100%">Measuring the Direction and Angular Velocity of a Black Hole Accretion Disk via Lagged Interferometric Covariance</style>