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[References: 31 tit.]

The paper under discussion has some shortcomings in regard to mathematical formulationof the problem related to acoustics, its justification, some references analyses and the text, and we feelthat this study has not been finished to its full extent. From the point of view of acoustic jet formation,the mathematical model used by the authors has a number of significant limitations which are nottaken into account. Moreover, the formal analogy between the parameters of electromagnetic wavesand acoustic waves should be used with caution in the conditions of localized beams (acoustic jet),and the limits of their application should be justified.