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books.google.com
Demianski, Marek; Sánchez, Norma; Parijskij, Yuri N. (2003). Topology of the universe and the cosmic microwave background radiation. The Early Universe and the Cosmic Microwave Background: Theory and Observations. Proceedings of the NATO Advanced Study Institute. The early universe and the cosmic microwave background: theory and observations. Vol. 130. Springer. p. 161. Bibcode:2003eucm.book..159D.
Demianski, Marek; Sánchez, Norma; Parijskij, Yuri N. (2003). Topology of the universe and the cosmic microwave background radiation. The Early Universe and the Cosmic Microwave Background: Theory and Observations. Proceedings of the NATO Advanced Study Institute. The early universe and the cosmic microwave background: theory and observations. Vol. 130. Springer. p. 161. Bibcode:2003eucm.book..159D.