• Performance analysis of freeware filtering algorithms for determining ground surface from airborne laser scanning dataJulge, Kalev; Ellmann, Artu; Gruno, AntiJournal of applied remote sensing2014 / p. 083573-1-083573-15 : ill https://doi.org/10.1117/1.JRS.8.083573 https://www.scopus.com/sourceid/9500154105 https://www.scopus.com/record/display.uri?eid=2-s2.0-84935844050&origin=inward&txGid=664f8573b171c93dccb387549402ea8a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20APPL%20REMOTE%20SENS&year=2014 https://www.webofscience.com/wos/woscc/full-record/WOS:000342353800001