1. Smoot, G.F., Lubin, P.M. Ap.J. 234, L83, 1979
2. Fixsen,D., Cheng, E., Wilkinson, D. Phys. Rev. Lett. 50, 620, 1983
3. Lukash, V. N., Naselski j, P. D., Novikov, I. D. Proc. Quantum Gravity-3, Moscow, 1984
4. Kozik, V.S., Lubimov, V.A., Novikov, E.G., Nozik, V.Z., Tretyakov, E.F., Nuclear Phys. 32, 301, 1980
5. Bisnovatyi-Kogan, G.S., Novikov, I.D. Astron. Zh. 57, 899, 1980