Ryszard Kozakiewicz. BOUNDARIES IN SPATIAL INFORMATION SYSTEMS - PROPOSAL OF A CLASSIFICATION FORMETADATA PURPOSES. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Informatics, Geoinformatics and Remote Sensing, 2017, pp. 827-834. https://doi.org/10.5593/sgem2017/21/s08.105