D'Ecclesiis, G. Polemio, M., 1994, Condizioni di emergenza della sorgente Niella di Lagonegro, Quaderni di geologia applicata 2 (1994): 343–350.,
URL: http://www.cnr.it/prodotto/i/232784

The Niella spring is located on north Mount Sirino slope. The spring aquifer is characterized by the presence of localized fissures in carbonatic rock. The spring is the highest of the aquifer end is placed at half slope. Flinty limestone outcrops along the whole slope; the spring area is characterized by debris outcrops. Spring water comes out in these conditions for described tectonic influence on aquifer permeability. Geological-structural conditions end the effects on groundwater flow are described

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