1. https://en.wikipedia.org/wiki/Gravitational_wave_background
2. Novikov, E.A. (2006) Vacuum Response to Cosmic Stretching: Accelerated Universe and Prevention of Singularity. arXiv:nlin/0608050
3. Novikov, E.A. (1970) Nonlinear Evolution of Disturbances in (1 + 1)-Dimensional Universe. Soviet Physics JETP, 30, 512-513. arXiv:1001,3709 [physics.gen-ph].
4. Dynamics of distributed sources
5. Novikov, E.A. (2005) Distributed Sources, Accelerated Universe and Quantum Entanglement. arXiv:nonlin.PS/0511040.