Cruz-Morales, D. C. J. A., D. C. J. Vargas, D. C. A. A. Santiago, and D. C. M. A. Tlenkopatchev. “Gas Permeability in Hydrogenated Polynorbornene Imides”. Revista Cubana De Química, vol. 27, no. 3, Oct. 2015, pp. 308-14, https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/248.