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(Ingelesez)Dirac, Paul Adrien Maurice. (1938-04-05). «A new basis for cosmology»Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences 165 (921): 199–208. doi:10.1098/rspa.1938.0053. ISSN0080-4630. (Noiz kontsultatua: 2024-05-13).
(Ingelesez)Dirac, Paul Adrien Maurice. (1938-04-05). «A new basis for cosmology»Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences 165 (921): 199–208. doi:10.1098/rspa.1938.0053. ISSN0080-4630. (Noiz kontsultatua: 2024-05-13).
(Ingelesez)Dirac, Paul Adrien Maurice. (1938-04-05). «A new basis for cosmology»Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences 165 (921): 199–208. doi:10.1098/rspa.1938.0053. ISSN0080-4630. (Noiz kontsultatua: 2024-05-13).