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Liang, Y.-J.; Ding, Y.; Levery, S. B.; Lobaton, M.; Handa, K.; Hakomori, S.-i. . (2013). Differential expression profiles of glycosphingolipids in human breast cancer stem cells vs. cancer non-stem cells. Proceedings of the National Academy of Sciences, 110(13), 4968–4973. doi:10.1073/pnas.1302825110 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research