Ramsey C, Griffiths PA, Stokes TR. Multi-rotor unmanned aerial vehicles (UVAs) and high-resolution compact digital cameras: a promising new method for monitoring changes to surface karst resources. AC [Internet]. 2014 Dec. 30 [cited 2024 May 4];43(2-3). Available from: https://ojs.zrc-sazu.si/carsologica/article/view/625