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Thomas Litt; Achim Brauer; Tomasz Goslar; Josef Merkt; Krystyna Bałaga; Helmut Müller; Magdalena Ralska-Jasiewiczowa; Martina Stebich; Jörg F.W. Negendank. (2001). Correlation and synchronisation of Lateglacial continental sequences in northern central Europe based on annually laminated lacustrine sediments. , 20(11), 0–1249. doi:10.1016/s0277-3791(00)00149-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research