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Ravn, J. P. J.. (1930).
Nogle bemaerkninger om Bornholms kridtaflejringer. Geologiska Foereningan i Stockholm. Foerhandlingar, 52(2), 279–283.
doi:10.1080/11035893009445928
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
