1[1]Thompson TS. Nitrate concentrations in private rural drinking water supplies in Saskatchewan, Canada[J].Bull Environ contam Toxicol, 2001 ; 66 : 64~ 70
2[2]Barret JH, parslow RC, McKinney PA, Law GR, et al. Nitrate in drinking water and the incidence of gastric, esophageal, and brain cancer in Yorkshire[J].England Cancer Causes Control, 1998; 9 (2): 153~159
3[3]Gelberg KH, Church L, Casey G, et al. Nitrate levels in drinking water in rural New York State[J]. Environ Res, 1999;80(1):34~40
4[4]Johnson CJ, Kross BC. Continuing importance of nitrate contamination of groundwater and wells in rural areas[J]. Am J Ind Med, 1990;18(4):449~456