Jakub Lomoznik, Jiri Fries (2017). CHANGE OF THE MATERIAL POSITION ORIENTATION. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies, 127-134. https://doi.org/10.5593/sgem2017/42/s17.017