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https://arxiv.org/pdf/1607.01620.pdf (Preprint)
Sandev, T., Iomin, A., & Mendez, V. (2016). Levy processes on a generalized fractal comb. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 49(35): 355001. doi:10.1088/1751-8113/49/35/355001.