ESSA, Abbas Fadhil. Preparation and study Impact and Hardness Strength for Gravel Nano Particles /Polyester Composites. University of Thi-Qar Journal of Science, University of Thi-Qar, Thi-Qar, Iraq, v. 4, n. 4, p. 40–45, 2014. DOI: 10.32792/utq/utjsci/v4i4.663. Disponível em: https://jsci.utq.edu.iq/index.php/main/article/view/663.. Acesso em: 3 apr. 2025.