Мильцын, Анатолий Михайлович, Виктор Исаакович Олевский, Ю.Б. Олевская, and В.В. Плетин. “Experimental Researches of Deformation and Stability of Covers Zero Gaussian Curvature”. Eastern-European Journal of Enterprise Technologies 2, no. 5(44) (April 6, 2010): 42–49. Accessed July 29, 2024. https://journals.uran.ua/eejet/article/view/2668.