F. Bosi, J-P. R. Wells, Angelo Tartaglia et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology|2011
P. Astone, J.-P. Zendri, A. Marini et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|2003