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Schofield, Karin M.; Wells, Jeremy M.; Le Page, Richard W.F.; Robinson, Karen; Chamberlain, Lisa M.. (1997). Oral vaccination of mice against tetanus with recombinant Lactococcus lactis. , 15(7), 653–657. doi:10.1038/nbt0797-653 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research