@incollection{UBHD-68226606,
  author={Actor, Alfred A. and Bender, Iring},
  title={Nonstationary states of harmonic oscillators and quantum fields},
  year={1999},
  pages={114-126$p13},
  language={eng},
  isbn={981-02-3820-7 and 978-981-02-3820-9},
  booktitle={The Casimir effect 50 years later},
  editor={Bordag, Michael},
}