Is the cosmological dark sector better modeled by a generalized Chaplygin gas or by a scalar field?Sergio del Campo, Júlio C. Fabris, Ramón Herrera and Winfried ZimdahlEur. Phys. J. C, 77 7 (2017) 479DOI: https://doi.org/10.1140/epjc/s10052-017-5051-y