Golfieri, Bruno; Hardersen, Sönke; Maiolini, Bruno; Surian, Nicola (2016). «Odonates as indicators of the ecological integrity of the river corridor: Development and application of the Odonate River Index (ORI) in northern Italy». Ecological Indicators61: 234-247. ISSN1470-160X. doi:10.1016/j.ecolind.2015.09.022.
Golfieri, Bruno; Hardersen, Sönke; Maiolini, Bruno; Surian, Nicola (2016). «Odonates as indicators of the ecological integrity of the river corridor: Development and application of the Odonate River Index (ORI) in northern Italy». Ecological Indicators61: 234-247. ISSN1470-160X. doi:10.1016/j.ecolind.2015.09.022.