The scenario of two families of compact stars - Part 1. Equations of state, mass-radius relations and binary systemsAlessandro Drago, Andrea Lavagno, Giuseppe Pagliara and Daniele PigatoEur. Phys. J. A, 52 2 (2016) 40DOI: https://doi.org/10.1140/epja/i2016-16040-3