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William J. Adelman; Yoram Palti; Joseph P. Senft. (1973). Potassium ion accumulation in a periaxonal space and its effect on the measurement of membrane potassium ion conductance. , 13(1), 387–410. doi:10.1007/bf01868237 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research