I. Zafiriadis, C. Nikolaidis, V. Mathioudakis, A.G. Kapagiannidis, A. Vantarakis, A. Aivasidis. Poster: “Study on the microbial diversity of denitrifiers present in wastewater and activated sludge samples based on the nitrite reductase genes” 15thHRWM Symposium, Naxos, Greece, 2009