Estimating compressibility from maximal-mass compact star observations Gergely G. Barnaföldi, Péter Pósfay, Balázs E. Szigeti and Antal Jakovác Eur. Phys. J. Special Topics, 229 22-23 (2020) 3605-3614 Published online: 21 December 2020 DOI: 10.1140/epjst/e2020-000108-4