Al-Zoubi, K. F., and F. Al-Turman. “On Graded 2-Classical Prime Submodules of Graded Modules over Graded Commutative Rings”. Proyecciones (Antofagasta, On Line), vol. 38, no. 4, Oct. 2019, pp. 753-61, doi:10.22199/issn.0717-6279-2019-04-0049.