A. H. Gandomi, A. Faramarzifar, P. Ghanad Rezaee, A. Asghari, and S. Talatahari, “New design equations for elastic modulus of concrete using multi expression programming”, JCEM, vol. 21, no. 6, pp. 761–774, Jun. 2015, doi: 10.3846/13923730.2014.893910.