@book{HooftHolsteinMakrietal.2001,
  author    = {Hooft, Gerard and Holstein, Barry and Makri, Nancy and Duru, Ismail and Ruffini, Remo and Janke, Wolfhard and Pelster, Axel and Schmidt, Hans-J{\"u}rgen and Bachmann, Michael},
  title     = {Fluctuating paths and fields : festschrift dedicated to Hagen Kleinert on the occasion of his 60the birthday},
  publisher = {World Scientific},
  address   = {River Edge, NJ},
  isbn      = {981-02-4648-X},
  pages     = {871 S.},
  year      = {2001},
  language  = {en}
}
@article{GurovichSchmidtTokareva2001,
  author    = {Gurovich, Viktor and Schmidt, Hans-J{\"u}rgen and Tokareva, Ira},
  title     = {Tunneling of the closed Friedmann Universe with generation of scalar waves},
  year      = {2001},
  abstract  = {The evolution of the closed Friedmann Universe with a packet of short scalar waves is considered with the help of the Wheeler-DeWitt equation. The packet ensures conservation of homogeneity and isotropy of the metric on average. It is shown that during tunneling the amplitudes of short waves of a scalar field can increase catastrophically promptly if their influence to the metric is not taken into account. This effect is similar to the Rubakov-effect of catastrophic particle creation calculated already in 1984. In our approach to the problem it is possible to consider a self- consistent dynamics of the expansion of the Universe and amplification of short waves. It results in a decrease of the barrier and interruption of amplification of waves, and we get an exit of the wave function from the quantum to the classically available region.},
  language  = {en}
}