Drupal-Bibcite0<style face="normal" font="default" size="100%">Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling</style><style face="normal" font="default" size="100%">Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling</style>