1. The cosmological constant problem
2. See e.g. W. Hollik, R.D. Peccei, in: J. Solà (Ed.), Proc. 4th Int. Symposium on Radiative Corrections (RADCOR 98) World Scientific 1999.
3. See e.g. I.L. Buchbinder, S.D. Odintsov, I.L. Shapiro, Effective Action in Quantum Gravity, IOP Publishing, Bristol, 1992.
4. Asymptotically finite theories and the screening of cosmological constant by quantum effects
5. I.L. Shapiro, J. Solà, work in progress.