Graziano, Kazuko Uchikawa, et al. “Reuse of Paraformaldehyde Tablets: Evaluation of the Sterilizing Activity”. Revista Da Escola De Enfermagem Da USP, vol. 36, no. 2, June 2002, pp. 184-92, https://doi.org/10.1590/S0080-62342002000200012.