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Yiannis Panagopoulos;Anastasios Papadopoulos;Georgios Poulis;Emmanouil Nikiforakis;Elias Dimitriou;. (2021). Assessment of an Ultrasonic Water Stage Monitoring Sensor Operating in an Urban Stream . Sensors, (), –. doi:10.3390/s21144689 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research