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Das, C.R., Laperashvili, L.V. & Tureanu, A. Superstring-inspired E 6 unification, shadow theta-particles and cosmology. Phys. Part. Nuclei 41, 965–968 (2010). https://doi.org/10.1134/S1063779610060316
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DOI: https://doi.org/10.1134/S1063779610060316