Tanja Branz, Alfredo Vega, Thomas Gutsche et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology|2010
Alfredo Vega, Valery E. Lyubovitskij, Thomas Gutsche et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology|2009