Patrik Flegner, Jan Kacur, Milan Durdan, Marek Laciak. SHEWHART CONTROL CHARTS AS A TOOL FOR ANALYZING THE REVOLUTIONS OF DRILLING EQUIPMENT. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Informatics, Geoinformatics and Remote Sensing, 2017, pp. 549-556. https://doi.org/10.5593/sgem2017/21/s07.070