SHASHIKANT SINGH, DR. NARENDRA KUMAR. Conceptual Foundations of Quantum Gravity: A Comparative Analysis of Loop Quantum Gravity and String Theory. International Journal of Engineering Science & Humanities, [S. l.], v. 9, n. 4, p. 121–136, 2019. Disponível em: https://www.ijesh.com/j/article/view/664. Acesso em: 12 may. 2026.