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Uematsu, C.. (2001). Multiplex polymerase chain reaction (PCR) with color-tagged module-shuffling primers for comparing gene expression levels in various cells. Nucleic Acids Research, 29(16), 84e–84. doi:10.1093/nar/29.16.e84 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research