The Act Of An Operator. Baghdad Science Journal, Iraq, Baghdad, v. 13, n. 2, p. 0388, 2016. DOI: 10.21123/bsj.2016.13.2.0388. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/2180.. Acesso em: 2 may. 2024.