1. H.-P. Breuer, F. Petruccione, The Theory of Open Quantum Systems (Oxford University Press, New York, 2002)
2. S.V. Anischenko, S.L. Cherkas, V.L. Kalashnikov, Functional minimization method addressed to the vacuum finding for an arbitrary driven quantum oscillator. Nonlinear Phenom. Complex Syst. 12(1), 16–26 (2009). (
arXiv:0806.1593
[quant-ph])
3. S.L. Cherkas, V.L. Kalashnikov, Quantum evolution of the universe in the constrained quasi-Heisenberg picture: from quanta to classics? J. Gravit. Cosmol. 12(2–3), 126–129 (2006). (
arXiv:gr-qc/0512107
)
4. B.S. DeWitt, Dynamical theory in curved spaces. I. A review of the classical and quantum action principles. Rev. Mod. Phys. 29, 377–397 (1957)
5. M. Bojowald, The Universe: A View from Classical and Quantum Gravity (Wiley-VCH, Weinheim, 2013)