References
- E.P.A. (U. S. Environmental Protection Agency), 1974: An approach to a relative trophic index system for classifying lakes and reservoirs. — Working Paper n. 24, Corvallis.
- Gaggino, G. F., Marchetti, R., Cappelletti, E. & Calcagnini, T., 1985: Water quality of the italian lakes during the years '80. — In: Lakes Pollution and Recovery, E.W.P.C.A. International Congress — Rome 15th-18th April, 1985: 91–103 (in Italian).
- I.R.S.A. (Istituto di Ricerca sulle Acque — Water Research Institute), 1985: Register of Italian Lakes (Vol. I, North-Italy). — Quaderni I. R. S. A., n. 72, Roma (in Italian).
- O.C.D.E. (Organization for Economic Cooperation and Development), 1982: Eutrophication of waters. Monitoring assessment and control. — O.C.D.E., Paris.