Vieira, Rejane Maria Lobo. “Some General Principles of Coin Conservation and the Mechanical Cleaning Process Adopted by the Museu Histórico Nacional”. Revista Do Museu De Arqueologia E Etnologia, no. 2, Dec. 1992, pp. 133-6, https://doi.org/10.11606/issn.2448-1750.revmae.1992.108999.