Distribution amplitudes of heavy mesons and quarkonia on the light front Fernando E. Serna, Roberto Correa da Silveira, J. J. Cobos-Martínez, Bruno El-Bennich and Eduardo Rojas Eur. Phys. J. C, 80 10 (2020) 955 Published online: 15 October 2020 DOI: 10.1140/epjc/s10052-020-08517-3