ZIELONKA, Dariusz, NIEREBIŃSKI, Mariusz, KALAJI, Hazem M., AUGUSTYNOWICZ, Janusz, PRĘDECKA, Anna and RUSSEL, Stefan. Efficiency of the photosynthetic apparatus in Cannabis sativa L. fertilized with sludge froma wastewater treatment plant and with phosphogypsum. Ecological Questions. Online. 15 February 2018. Vol. 28, pp. 55-61. [Accessed 14 June 2026]. DOI 10.12775/EQ.2017.039.