7US EPA. Risk assessment guidance for superfund (RAGS) - Volume 1 :Human health evaluation manual (Part B)-de- velopment of risk-based preliminary remediation goals. EPA/540/R-92/O03.
8Washington DC : Office of Emergency and Remedial Response US EPA,2001 Agusa T. , Kunito T. , Fujihara J. , et al. Contamination by Arsenic and other trace elements in tube-well water and its risk assessment to humans in Hanoi, Vietnam. Environmen- tal Pollution ,2006,139 ( 1 ) :95-106.
9Tchounwou P. B. , Centeno J. A. , Patlolla A. K. Arsenic tox- icity, mutagenesis, and carcinogenesis : A health risk assess- ment and management approach. Molecular and Cellular Bi- ochemistry ,2004,255 ( 1-2 ) :47-55.
10Giachetti R. E. , Young R. E. A parametric representation of fuzzy numbers and their arithmetic operators. Fuzzy Sets and Systems, 1997,91 ( 2 ) : 185-202.
