1. Alvarenga, F.G., de la Cruz-Dombriz, A., Houndjo, M.J.S., Rodrigues, M.E., Sáez-Gómez, D.: Phys. Rev. D 87, 103526 (2013a). arXiv:1302.1866 [gr-qc]
2. Bamba, K., Capozziello, S., Nojiri, S., Odintsov, S.D.: (2012). arXiv:1205.3421 [gr-qc]
3. Bennett, C.L., et al.: Astrophys. J. Suppl. Ser. (2012). Accepted. arXiv:1212.5225v3 [astro-ph.CO]
4. Boisseau, B., Esposito-Farese, G., Polarski, D., Starobinsky, A.A.: Phys. Rev. Lett. 85, 2236 (2000). arXiv:gr-qc/0001066
5. Capozziello, S., De Laurentis, M.: Phys. Rep. 509, 167 (2011). arXiv:1108.6266 [gr-qc]