Souza Filho, N. E., B. C. Oliveira, M. L. da Silva, and J. Vielliard. “Automatic Classification of Turdus Rufiventris Song Notes By Spectrographic Image Template Matching”. Ciência E Natura, vol. 36, no. 2, Nov. 2014, pp. 646-54, doi:10.5902/2179460X11303.