Zdroj: |
Heiskanen, V. A. - Niskanen, E. - Karki, P.: Topographic-isostatic reduction maps for Europe and North Atlantic in the Hayford zones 18-1 for the Airy-Heiskanen system T=0 km and 20 km, 1959 www(Kansalliskirjasto), cit. 13. 5. 2020 DNB, cit. 13. 5. 2020 www(Wikipedia, the free encyclopedia), cit. 13. 5. 2020 |