Development of monitoring of water bodies ecological status by the example of small lakes in the North-western Ladoga regionVasiliy Dmitriev, Svetlana Sedova, Anastasiia Plenkina, Viktoriia Khomiakova, Diana Avdeevich, Valeriia Ladanova, Andrei Ukis and Nikolai PaniutinE3S Web Conf., 163 (2020) 03002DOI: https://doi.org/10.1051/e3sconf/202016303002