VALLE, P. E. Sull’ Interazione fra le particelle del solido ideale. Annals of Geophysics, [S. l.], v. 16, n. 4, p. 681–687, 1963. DOI: 10.4401/ag-5257. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5257. Acesso em: 28 sep. 2022.