Piloyan, Artak, and Milan Konečný. “SEMI-AUTOMATED CLASSIFICATION OF LANDFORM ELEMENTS IN ARMENIA BASED ON SRTM DEM USING K-MEANS UNSUPERVISED CLASSIFICATION”. Quaestiones Geographicae, vol. 36, no. 1, Mar. 2017, pp. 93-103, doi:10.1515/quageo-2017-0007.