Alejandro Ayala, Sarira Sahu, Ángel Sánchez et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|2005
Alejandro Ayala, Ángel Sánchez, Adnan Bashir et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|2009