Induction of gastrointestinal tract nuclear anomalies in B6C3F1 mice by 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone and 3,4-(dichloro)-5-hydroxy-2(5H)-furanone, mutagenic byproducts of chlorine disinfection [microform] / F.B. Daniel, G.R. Olson, and J.A. Stober