Biotests and biosensors in ecotoxicological risk assessment of field soils polluted with zinc, lead, and cadmiumKahru, Anne; Ivask, Angela; Kasemets, Kaja; Põllumaa, Lee; Kurvet, Imbi; Francois, Matthieu; Dubourguier, Henri-CharlesEnvironmental toxicology and chemistry2005 / 11, p. 2973-2982