Effective friction of granular flows made of non-spherical particlesEllák Somfai, Dániel B. Nagy, Philippe Claudin, Adeline Favier, Dávid Kálmán and Tamás BörzsönyiEPJ Web Conf., 140 (2017) 03062DOI: https://doi.org/10.1051/epjconf/201714003062