1. Environmental Protection Agency, 1991a, Methods for Aquatic Toxicity Identification Evaluations: Phase 1 Toxicity Characterization Procedures, EPA/600/6–91/003, Office of Research and Development, Washington, DC.
2. Environmental Protection Agency, 1991b, Toxicity Identification Evaluation: Characterization of Chronically Toxic Effluents, Phase I, EPA/600/6–91/005, Office of Research and Development, Washington, DC.
3. Environmental Protection Agency, 1989. Methods for Aquatic Toxicity Identification Evaluations: Phase II Toxicity Identification Procedures, EPA/600/3–88/035, Office of Research and Development, Washington, DC.