Pieri, L., Ventura, F., Ventura, M., Tagliavini, M., Ponti, M., Pistocchi, R., Albertazzi, S., Vignudelli, M. and Rossi Pisa, P. 2011. Chemical and biological indicators of water quality in three agricultural watersheds of the Po valley, Italy. Italian Journal of Agronomy. 6, 4 (Dec. 2011), e36. DOI:https://doi.org/10.4081/ija.2011.e36.