1. The Nature of Time;Gold,1967
2. The Origin of Structure in the Universe;Halliwell;Phy. Rev.,1984
3. Wave Function Of The Universe;Hertle;Phys. Rev.,1983
4. The Quantum State Of The Universe;Hawking;Nucl. Phys. B,1984
5. The Arrow Of Time In Cosmology;Hawking;Phys. Rev.,1985