Using Ground Penetrating Radar for Permafrost Monitoring from 2015-2017 at CALM Sites in the Pechora River Delta. - Maria Sudakova; Marat Sadurtdinov; Andrei Skvortsov; Andrei Tsarev; Galina Malkova; Nadezda Molokitina; Vladimir E. Romanovsky (Remote. Sens., 2021)