P. Zagata, M. KopaÅ„ska, M. Greczek-Stachura, and T. Burnecki, “ACUTE TOXICITY OF METALS: NICKEL AND ZINC TO PARAMECIUM BURSARIA AND ITS ENDOSYMBIONTS”, J microb biotech food sci, vol. 4, no. special issue 2 (Biotechnology), pp. 128–131, Feb. 2015.