ПИЛИПАКА, Т. С.; ПИЛИПАКА, О. А. Designing helical surfaces related to coordinate curvature lines. Technology audit and production reserves, [S. l.], v. 1, n. 1(15), p. 30–34, 2014. DOI: 10.15587/2312-8372.2014.21221. Disponível em: https://journals.uran.ua/tarp/article/view/21221. Acesso em: 25 jul. 2024.