Potts model with invisible states: a reviewMariana Krasnytska, Petro Sarkanych, Bertrand Berche, Yurij Holovatch and Ralph KennaEur. Phys. J. Spec. Top., 232 11 (2023) 1681-1691DOI: https://doi.org/10.1140/epjs/s11734-023-00843-3