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Robert G Latta;Jeffry B Mitton;. (1997). A Comparison of Population Differentiation Across Four Classes of Gene Marker in Limber Pine (<i>Pinus flexilis</i> James) . Genetics, (), –. doi:10.1093/genetics/146.3.1153 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research