Ribeiro, Andréa Pinto Leite, et al. “ Effectiveness Of 2% And 4% Papain Gels In The Healing Of Venous Ulcers ”. Revista Da Escola De Enfermagem Da USP, vol. 49, no. 3, June 2015, pp. 394-00, https://doi.org/10.1590/S0080-623420150000300006.