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Ivan Kunchev. SYSTEMS APPROACH TO THE STATE LEVELLING NETWORK OF THE REPUBLIC OF BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Informatics, Geoinformatics and Remote Sensing, 2021, pp. 213-220. https://doi.org/10.5593/sgem2021/2.1/s09.54
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Ivan Kunchev. SYSTEMS APPROACH TO THE STATE LEVELLING NETWORK OF THE REPUBLIC OF BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Informatics, Geoinformatics and Remote Sensing, 2021, pp. 213-220. https://doi.org/10.5593/sgem2021/2.1/s09.54