Zielonka, D., Nierebiński, M., Kalaji, H. M., Augustynowicz, J., Prędecka, A., & Russel, S. (2018). Efficiency of the photosynthetic apparatus in Cannabis sativa L. fertilized with sludge froma wastewater treatment plant and with phosphogypsum. Ecological Questions, 28, 55–61. https://doi.org/10.12775/EQ.2017.039