Podgórski, A. and Tomaszewska-Szewczyk, A. 2016. Tortoiseshell, Bioorganic Material in Artistic Crafts – Issues of Material Science, Technology and Design Techniques, and Destruction. Acta Universitatis Nicolai Copernici [Heritage Studies and Conservation Science]. 46, (Jun. 2016), 449–467. DOI:https://doi.org/10.12775/AUNC_ZiK.2015.018.