Marani Barzani M, Salleh KBO. Surface grain size variation within gravel bars: a case study of the River Opava, Czech Republic. Geog. Fis. Dinam. Quat. [Internet]. 2016 Jun. 30 [cited 2026 May 2];39(1):13-20. Available from: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/121