Ş. Kırış, Y. Kasap. Development of the Productivity in European Aggregate Production: 8th International Symposium on Aggregates (2016) Kutahya, Turkey. IJEEG [Internet]. 2017 Mar. 14 [cited 2025 Sep. 10];8(1):46-52. Available from: https://econ-environ-geol.org/index.php/ojs/article/view/488