Non-commutative Einstein equations and Seiberg-Witten map     

        Endless surprises with cosmological singularities

        Averaging procedure in variable-G cosmologies

        Spherically symmetric gravity with variable G

        Quantum gravity: unification of principles and interactions

      Quantum cosmology from three different perspectives

      A new spectral cancellation in quantum gravity

      Euclidean Quantum Gravity: field theoretical and cosmological aspects