E.  Mahmoudi, Essid, N., Beyrem, H., Hedfi, A., Boufahja, F., Vitiello, P., and Aissa, P., ?Individual and combined effects of lead and zinc on a free-living marine nematode community: Results from microcosm experiments?, Journal of Experimental Marine Biology and Ecology, vol. 343, pp. 217-226, 2007.

H.  Beyrem, Mahmoudi, E., Essid, N., Hedfi, A., Boufahja, F., and Aissa, P., ?Individual and combined effects of cadmium and diesel on a nematode community in a laboratory microcosm experiment?, Ecotoxicology and Environmental Safety, vol. 68, pp. 412-418, 2007.