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Cornelis Verduyn; Timotheus P. L. Zomerdijk; Johannes P. Dijken; W. Alexander Scheffers. (1984). Continuous measurement of ethanol production by aerobic yeast suspensions with an enzyme electrode. , 19(3), 181–185. doi:10.1007/bf00256451 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research