Drupal-Bibcite0<style face="normal" font="default" size="100%">Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87* and Sgr A*</style><style face="normal" font="default" size="100%">Positron Effects on Polarized Images and Spectra from Jet and Accretion Flow Models of M87* and Sgr A*</style>