L. C. Leventhal, R. C. Bianchi, and S. M. J. V. de Oliveira, “Clinical trial comparing three types of cryotherapy in non-pregnant women”, Rev. Esc. Enferm. USP, vol. 44, no. 2, pp. 339–345, Jun. 2010, doi: 10.1590/S0080-62342010000200014.