Universidad Internacional Menéndez Pelayo, Sanz, J. L., & Goicoechea, L. J. (1985). Observational and theoretical aspects of relativistic astrophysics and cosmology: Proceedings of the international course held at Santander, Spain, September 3-7, 1984. World Scientific.

Universidad Internacional Menéndez Pelayo, J. L. Sanz, a L. J. Goicoechea. Observational and Theoretical Aspects of Relativistic Astrophysics and Cosmology: Proceedings of the International Course Held at Santander, Spain, September 3-7, 1984. Singapore: World Scientific, 1985.

Universidad Internacional Menéndez Pelayo, et al. Observational and Theoretical Aspects of Relativistic Astrophysics and Cosmology: Proceedings of the International Course Held at Santander, Spain, September 3-7, 1984. World Scientific, 1985.