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Doncho V. Zhelev; David Needham. (1993). Tension-stabilized pores in giant vesicles: determination of pore size and pore line tension. , 1147(1), 0–104. doi:10.1016/0005-2736(93)90319-u 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research