1. Halliwell, J.J.: Quantum Cosmology and Baby Universes. In: Coleman, S., Hartle, J.B., Piran, S.T., Weinberg, S. (eds.) Proceedings of the 1990 Jerusalem Winter School. World Scientific Singapore, Singapore (1991)
2. Wiltshire, D.L.: An introduction to quantum cosmology. In: Robson, B., Visvanathan, N., Woolcock, W.S. (eds.) Cosmology: The Physics of the Universe, p. 473. World Scientific Singapore, Singapore (1996)
3. Atkatz, D.: Quantum cosmology for pedestrians. Am. J. Phys. 62, 619 (1994)
4. Bojowald, M.: Quantum Cosmology: A Fundamental Description of the Universe. Springer, Berlin (2011)
5. Zloshchastiev, K.G.: Spontaneous symmetry breaking and mass generation as built-in phenomena in logarithmic nonlinear quantum theory. Acta Phys. Polon. B 42, 261 (2011)