Analysis of dental enamel thickness in bears with special attention to Ursus spelaeus and U. wenzensis (=minimus) in comparison to selected representatives of mammals - Mackiewicz, Paweł; Wiszniowska, Teresa; Olejniczak, Anthony J.; Stefaniak, Krzysztof ‎; Socha, Paweł; Nadachowski, Adam (2010)