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. 2019 Nov 18;7(1):10–30. doi: 10.1002/celc.201901495

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©2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

PMC Copyright notice

Demonstration of flow control by varying inlet arm lengths in Y‐shaped paper strips. Reprinted with permission.23 Copyright 2010 Royal Society of Chemistry. (b) Cross diffusion of bi‐laminar flow on different Y‐shaped paper strips. Reprinted with permission.37 Copyright 2019 Elsevier.