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. 2016 Jul 22;3(1):22. doi: 10.1186/s40323-016-0077-5

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© The Author(s) 2016

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. 2 — Interface problem. Rectangular domain $Ω$ composed of two subdomains $Ω_{1}$ and $Ω_{2}$ with common interface $Γ$