Hubner, W. ., Gradt, T. ., Schneider, T. ., & Borner, H. . (1998). Tribological behaviour of materials at cryogenic temperatures. Wear, 216(2), 150-159+. https://doi.org/10.1016/S0043-1648(97)00187-7 (Original work published)

Schmidtchen, U. ., Gradt, T. ., & Wursig, G. . (1993). Safe Handling of Large Quantities of Liquid-Hydrogen. Cryogenics, 33(8), 813-817+. https://doi.org/10.1016/0011-2275(93)90193-R (Original work published 2025)

Theiler, G. ., & Gradt, T. . (2007). Polymer Composites For Tribological Applications In Hydrogen Environment. Presented at the. Retrieved from http://conference.ing.unipi.it/ichs2007/fileadmin/user_upload/CD/PAPERS/11SEPT/1.4.43.pdf