Pitter, Williams, Zoraida Morantes, Antonio Aguillón, Romer Urdaneta, and Angel Ochoa. “An Overview on the Quasar Redshifts”. Rev. Téc. Fac. Ing. Univ. Zulia 19, no. 3 (1). Accessed June 10, 2025. https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5513.