Source: https://www.researchgate.net/profile/Agnieszka-Bigaj-Van-Vliet/publication/260096044_The_2010_fib_MODEL_CODE_FOR_CONCRETE_STRUCTURES_A_NEW_APPROACH_IN_STRUCTURAL_ENGINEERING/links/0a85e52fc8a49100db000000/The-2010-fib-MODEL-CODE-FOR-CONCRETE-STRUCTURES-A-NEW-APPROACH-IN-STRUCTURAL-ENGINEERING.pdf