STRZELECKI, Pawel; SZUMANSKA, Marta; VON DER MOSEL, Heiko. A geometric curvature double integral of Menger type for space curves. Annales Fennici Mathematici, [S. l.], v. 34, n. 1, p. 195–214, 2009. Disponível em: https://afm.journal.fi/article/view/135261. Acesso em: 10 dec. 2025.