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Pfefferkorn, Herman W.; Archer, Allen W.; Zodrow, Erwin L. . (2001). Modern tropical analogs for Carboniferous standing forests: Comparison of extinct <i>Mesocalamites</i> with extant <i>Montrichardia</i>. Historical Biology, 15(3), 235–250. doi:10.1080/10292380109380595 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research