C.A. Hallman; Ruud P. B. Foppen; Chris A. M. Van Turnhout; Hans De Kroon; Eelke Jongejans, 2014, "Declines in insectivorous birds are associated with high neonicotinoid concentrations", Nature, 511 (7509): 341–3. doi:10.1038/nature13531. PMID 25030173. S2CID 4464169