no. 2
Quantum theory of scalar field in de Sitter space-time
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 9 (1968) no. 2, pp. 109-141. 
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     title = {Quantum theory of scalar field in de {Sitter} space-time},
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     pages = {109--141},
     publisher = {Gauthier-Villars},
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     number = {2},
     year = {1968},
     mrnumber = {270704},
     zbl = {0162.57802},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1968__9_2_109_0/}
}
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Chernikov, N. A.; Tagirov, E. A. Quantum theory of scalar field in de Sitter space-time. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 9 (1968) no. 2, pp. 109-141. http://www.numdam.org/item/AIHPA_1968__9_2_109_0/

[1] N.A. Chernikov, E.D. Feydun'Kin and E.A. Tagirov, Preprint JINR P2-3392. Dubna, 1967 (in Russian).

[2] W. Thirring, Special Problems in High Energy Physics. Springer, Wien-New York, 1967, p. 269.

[3] P. Roman and J.J. Aghassi, Nuovo Cim., t. 38, 1965, p. 1092. | MR

[4] J.P. Vigier, Proceedings of the International Symposium on Non Local Quantum Field Theory. Preprint JINR P2-3590, Dubna, 1968.

[5] R. Penrose, Relativity, Groups and Topology. Gordon and Breach, London, 1964, p. 565.

[6] O. Nachtmann, Comm. Math. Phys., t. 6, 1967, p. 1. | MR | Zbl

[7] E.A. Tagirov and N.A. Chernikov, Dokl. Akad. Nauk SSSR, t. 160, n° 5, 1965 (in Russian).

[8] N.A. Chernikov, J. E. T. P., t. 53, 1967, p. 1006 (in Russian). | Zbl

[9] N.A. Chernikov,Proceedings of the International Symposium on Non Local Quantum Field Theory. Preprint JINPR P2-3590, Dubna, 1968.

[10] D. Gilbert, Nachr. v. d. Kon. Ges. d. Wiss. z. Gott. Math. Phys. Kl., Heft 3, 1915, p. 395-407.

[11] N.A. Chernikov, Acta Phys. Polon., t. 26, 1964, p. 1069. | MR

[12] N.N. Bogolubov, Vectn. MGU, n° 7, 1947, p. 43; Journ. of Phys., t. 9, 1947, p. 23.