WOLODTSCHENKO, Alexander; HRUBY, Florian. Geodäsie als Metasystem. meta-carto-semiotics, [S.l.], v. 8, n. 1, apr. 2017. ISSN 1868-1387. Available at: <http://ojs.meta-carto-semiotics.org/index.php/mcs/article/view/44>. Date accessed: 09 dec. 2019.