Šebo, J., P. Maleg, J. Mihok, and D. Šebo. “Mould Effeciency As an Element of Production Effeciency”. Advanced Technologies and Materials, vol. 31, no. 1-2, Dec. 2006, pp. 101-7, https://jged.uns.ac.rs/index.php/atm/article/view/jtp.2006.31.1-2.9.