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. 2021 Feb 14;106(2):1433–1452. doi: 10.1007/s11071-021-06244-2

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© The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 3 — a A schematic dynamics of coronavirus cases in Germany for the first wave of pandemic. The start is 1 March 2020 (here we designate x = t, in days). b A schematic dynamics of coronavirus cases in Germany for second wave of pandemic. The start is 1 November 2020 (here we designate x = t, in days)