J. C. Rando, J. A. Alcover, S. L. Olson, and H. Pieper, “A new species of extinct scops owl (Aves: Strigiformes: Strigidae: Otus) from São Miguel Island (Azores Archipelago, North Atlantic Ocean)”, Zootaxa, vol. 3647, no. 2, pp. 343–357, May 2013.