C. Ratnayake, C. Morosinotto, S. Ruuskanen, A. Villes, ja R. L. Thomson, ”Passive Integrated Transponders (PIT) on a small migratory passerine bird: absence of deleterious short and long-term effects”, Ornis Fenn, vsk. 91, nro 4, ss. 244–255, joulu 2014.