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nih.gov
pubmed.ncbi.nlm.nih.gov
Karras, David J.; Farrell, S.E.; Harrigan, R.A.; Henretig, F.M.; Gealt, L. (1996). »Poisoning from "Spanish fly" (cantharidin)«. The American Journal of Emergency Medicine. Zv. 14, št. 5. str. 478–83. doi:10.1016/S0735-6757(96)90158-8. PMID8765116.