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Sanford, J.C.. (1993). [Methods in Enzymology] Recombinant DNA Part H Volume 217 || [36] Optimizing the biolistic process for different biological applications. , (), 483–509. doi:10.1016/0076-6879(93)17086-K 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research