Models to estimate river temperature. Example for Danube, at Oltenița in the context of climate change and anthropic impactDaniela-Elena Gogoașe-Nistoran, Cristina Sorana Ionescu and Ioana OprișE3S Web Conf., 286 (2021) 04003DOI: https://doi.org/10.1051/e3sconf/202128604003