D. de Campos and L. Buso, “Deaf sign language hidden in the fresco The Crucifixion of Saint Peter by Michelangelo Buonarroti (1475-1564): Michelangelo and deaf sign language”, Acta Biomed, vol. 91, no. 4, p. e2020192, Nov. 2020, doi: 10.23750/abm.v91i4.9069.