Muniesa, M., Á. Fernández, I. Clavería, C. Javierre, J. A. Sarasua, and M. Blanco. “A New Extrusion Head With Integrated Ultrasonic Device and Online Process Parameters Measurements System — Design and Testing”. Polimery, vol. 60, no. 3, Mar. 2015, pp. 209-16, doi:10.14314/polimery.2015.209.