Evolutionary trends in the fourth lower premolar of Ursus rossicus Borissiak, 1930: Molarisation of p4 in spelaeoid bears Marina V. Sotnikova , Dmitriy O. Gimranov , Polina P. Nikolskaia , Mariya V. Pavlova 2025 | volume 81 | issue 1-2 | pages 189–202 PDF