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J. High Energy Phys. Gravit. Cosmol. Vol.5 No.1, January 18, 2019
DOI:10.4236/jhepgc.2019.51014
J. High Energy Phys. Gravit. Cosmol. Vol.5 No.1, January 09, 2019
DOI:10.4236/jhepgc.2019.51012