Phase diagrams of charged compact boson stars Sanjeev Kumar, Usha Kulshreshtha, Daya Shankar Kulshreshtha and Jutta Kunz Eur. Phys. J. C, 79 6 (2019) 496 Published online: 12 June 2019 DOI: 10.1140/epjc/s10052-019-7006-y