Microspheres as potential fillers in composite polymeric materials Anna Magiera, Monika Kuźnia, Wojciech Jerzak, Magdalena Ziąbka, Radosław Lach and Bartosz Handke E3S Web Conf., 108 (2019) 02009 Published online: 05 July 2019 DOI: 10.1051/e3sconf/201910802009