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Wippermann, K.; Klafki, K.; Kulikovsky, A.A. . (2014). In situ measurement of the oxygen diffusion coefficient in the cathode catalyst layer of a direct methanol fuel cell. Electrochimica Acta, 141(), 212–215. doi:10.1016/j.electacta.2014.06.164 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research