Micro-hardness of surface layer of irradiated Polybutene Terephthalate (PBT)David Manas, Miroslav Manas, Martin Ovsik, Michal Stanek, Lenka Chvatalova, Pavel Stoklasek and Lenka HylovaMATEC Web Conf., 76 (2016) 02018DOI: https://doi.org/10.1051/matecconf/20167602018