Klyachin, V.A., and V.M. Miklyukov. “Geometric Structure of Tubes and Bands of Zero Mean Curvature in Minkowski Space”. Annales Fennici Mathematici 28, no. 2 (August 1, 2003): 239–270. Accessed May 17, 2024. https://afm.journal.fi/article/view/135076.