Bignotti , D., A. Gracco, G. Bruno, and A. De Stefani. “FEM IN ORTHODONTICS: A REVIEW OF THE PALATAL EXPANDERS CLINICAL INVESTIGATION”. Oral & Implantology, vol. 12, no. 2, June 2019, pp. 161-7, https://www.oimplantology.org/oimp/article/view/288.