Flexural behavior of two-layer beams made with normal and lightweight concrete layers. Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 2, p. 1124–1140, 2021. DOI: 10.21533/pen.v9.i2.814. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/814. Acesso em: 12 oct. 2025.