Doukas, Ioannis D., Dimitrios Ampatzidis, e Vassileios Kampouris. “THE VALIDATION OF THE TRANSFORMATION BETWEEN AN OLD GEODETIC REFERENCE FRAME AND A MODERN REFERENCE FRAME, BY USING EXTERNAL SPACE TECHNIQUES SITES: THE CASE STUDY OF THE HELLENIC GEODETIC REFERENCE SYSTEM OF 1987”. Boletim de Ciências Geodésicas 23, no. 3 (setembro 25, 2017). Acessado janeiro 20, 2025. https://revistas.ufpr.br/bcg/article/view/55432.