P. B. Barbosa, M. M. Franco, F. de O. Souza, F. I. Antônio, T. Montezuma, and C. H. J. Ferreira, “ Comparison between measurements obtained with three different perineometers ”, Clinics, vol. 64, no. 6, pp. 527–533, Jun. 2009, doi: 10.1590/S1807-59322009000600007.