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. 2021 Dec 29;45(8):4625–4642. doi: 10.1002/mma.8057

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© 2021 John Wiley & Sons, Ltd.

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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mma8057-fig-0006 — Approximate solutions of H, R, W with parameters of Table 2 for different values of $α = 1,0 . 9,0 . 8,0 . 7,0 . 6$ [Colour figure can be viewed at wileyonlinelibrary.com]