Spectrum of scalar and pseudoscalar glueballs from functional methods Markus Q. Huber, Christian S. Fischer and Hèlios Sanchis-Alepuz Eur. Phys. J. C, 80 11 (2020) 1077 Published online: 20 November 2020 DOI: 10.1140/epjc/s10052-020-08649-6