On the critical end point in a two-flavor linear sigma model coupled to quarksAlejandro Ayala, L. A. Hernández, M. Loewe, Juan Cristobal Rojas and R. ZamoraEur. Phys. J. A, 56 2 (2020) 71DOI: https://doi.org/10.1140/epja/s10050-020-00086-z