1. Alexander, S.: A quantum gravitational relaxation of the cosmological constant. Phys. Lett. B 629, 53–59 (2005). arXiv:hep-th/0503146
2. Scherer, S.: Bouncing neutrons in the gravitational field. Entry posted to backreaction.blogspot.com. Retrieved March 29, 2008, from http://backreaction.blogspot.com/2007/06/bouncing-neutrons-in-gravitational.html , June 1 (2007)
3. Smolin, L.: Quantum gravity with a positive cosmological constant. arXiv:hep-th/0209079
4. Randono, A.: Generalizing the Kodama state. I. Construction. arXiv:gr-qc/0611073
5. Randono, A.: Generalizing the Kodama state. II. Properties and physical interpretation. arXiv:gr-qc/0611074