Ulmanu , V., Zisopol , D. и Trifan , C. (2007) "Experimental Research Concerning the Influence of External Diameteron the Behavior of Coiled Tubing to Cyclic Bending With Internal Pressure", Записки Горного института, 170(2), сс. 46-48. доступно на: https://pmi.spmi.ru/pmi/article/view/7711 (просмотрено: 5 декабрь 2025).

Ulmanu , V., Zisopol , D. and Trifan , C. (2007) "Experimental Research Concerning the Influence of External Diameter on the Behavior of Coiled Tubing to Cyclic Bending With Internal Pressure", Journal of Mining Institute, 170(2), pp. 46-48. Available at: https://pmi.spmi.ru/pmi/article/view/7711 (Accessed: 5 December 2025).