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The Publisher regrets that this article is an accidental duplication of an article that has already been published in Wave Motion Volume 84, January 2019, Pages 1-7, http://dx.doi.org/10.1016/j.wavemoti.2018.09.018. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
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С. В. Кузнецов (2018) studied this question.
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