Reitmaier S., Wolfram U., Ignatius A., Wilke H. - J., Martín-Martínez J. M., Silva-Correia J., Oliveira J. M., Reis R. L., and Schmidt H.,  "Investigation of different hydrogels for nucleus replacement ? A biomechanical study",  Journal of Biomechanics, vol. 45, issue Suppl.1, pp. S51, 2012.