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F. Bianchi; M. Careri; M. Musci; A. Mangia. (2007). Fish and food safety: Determination of formaldehyde in 12 fish species by SPME extraction and GC–MS analysis. , 100(3), 1049–1053. doi:10.1016/j.foodchem.2005.09.089 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research