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Bruce R. Zetter and Gail R. Martin. (1978). Expression of a High Molecular Weight Cell Surface Glycoprotein (LETS Protein) by Preimplantation Mouse Embryos and Teratocarcinoma Stem Cells. Proceedings of the National Academy of Sciences of the United States of America, 75(5), 2324–2328. doi:10.2307/68438 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research