et.al, J.-Y. Y. “Development of 3D Concrete Extrusion Nozzle for Producing Free-Form Concrete Panels”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 12, no. 6, Apr. 2021, pp. 427-36, https://www.turcomat.org/index.php/turkbilmat/article/view/1859.