1. Ion antagonism in microorganisms: interference of normal magnesium metabolism by nickel, cobalt, cadmium, zinc and manganese;Abelson;J. Bact.,1950
2. Toxicity of copper to activated sludge;Ayers,1965
3. The influence of trivalent chromium on the biological treatment of domestic sewage;Bailey;Wat. Pollut. Control,1970
4. Summary report on the effects of heavy metals on the biological treatment processes;Barth;J. Wat. Pollut. Control. Fed.,1965
5. Influence of zinc upon biological treatment by activated sludge;Bonomo;Ingegneria Ambientale,1974