Researches on increasing the dissolved oxygen concentration in stationary watersMarilena Monica Boltinescu (Roza), Nicolae Vlad Sima, Dorina Nicoleta Albu, Mihaela Petroşel (Bănică) and Mihaela ConstantinE3S Web Conf., 286 (2021) 01001DOI: https://doi.org/10.1051/e3sconf/202128601001