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20) B. Fraga …. N. Sahakyan, Frontiers in Astronomy and Space Sciences, 2018, 5, id.1.

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23) D. Zargaryan, N. Sahakyan and H. Harutyunian, IJMP D, 2018, 27, id. 1844022.

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27) IceCube Collaboration; M. Aartsen,............N. Sahakyan, Science, 2018, 361, p. 147.

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33) N. Sahakyan, and S. Gasparyan, AIP Conference Proceedings, 2017, 1792, id.050005.

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38) N. Sahakyan, EPJ Web of Conferences, 2016, 121, id.05005.

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40) N. Sahakyan, G. Piano and M. Tavani, ApJ, 2014, 780, article id. 29, 7

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