TY - CPAPER AU - Sebahattin Bektas TI - WHICH REFERENCE SURFACE? ROTATIONAL OR TRIAXIAL ELLIPSOID T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, INFORMATICS, GEOINFORMATICS AND REMOTE SENSING PY - 2015 DO - 10.5593/sgem2015/b22/s9.076 PB - Stef92 Technology ER -