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Decristan, Jasmin; Hondrich, A. Lena; Büttner, Gerhard; Hertel, Silke; Klieme, Eckhard; Kunter, Mareike; Lühken, Arnim; Adl-Amini, Katja; Djakovic, Sanna-K.; Mannel, Susanne; Naumann, Alexander; Hardy, Ilonca . (2015). Impact of Additional Guidance in Science Education on Primary Students’ Conceptual Understanding. The Journal of Educational Research, (), 1–13. doi:10.1080/00220671.2014.899957 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research