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<https://www.dggv.de/e-publikationen/fracture-network-characterization-and-dfn-modelling-of-the-upper-carboniferous-ruhr-area-germany/>
<https://www.dggv.de/e-publikationen/fracture-network-characterization-and-dfn-modelling-of-the-upper-carboniferous-ruhr-area-germany/>