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. 2019 Aug 13;79(5):1831–1883. doi: 10.1007/s00285-019-01412-w

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 10 — Illustration of discretizing the time interval [0, t] into M bins (each $Δ t = t / M$ wide) in order to derive the integral equations (A1b) and (A1c)