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Meijer, Marieke; Hendriks, Hester S.; Heusinkveld, Harm J.; Langeveld, Wendy T.; Westerink, Remco H.S. . (2014). Comparison of plate reader-based methods with fluorescence microscopy for measurements of intracellular calcium levels for the assessment of in vitro neurotoxicity. NeuroToxicology, 45(), 31–37. doi:10.1016/j.neuro.2014.09.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research