1. Alter, H. W., and Oswald, R. A.: 1987, ?Nationwide Distribution of Indoor Radon Measurements: A Preliminary Data Base?, JAPCA, 37(3), 227?231.
2. Becker, R. A., Chambers, J. M., and Wilks, A. R.: 1988, The New S Language, Wadsworth & Brooks/Cole Advanced Software and Books, Pacific Grove, CA.
3. National Research Council Committee on Biological Effects of Ionizing Radiation (BEIR-IV): 1988, Health Risk of Radon and Other Internally Deposited Alpha-Emitters. National Academy Press, Wahington, D.C.
4. Bierma, T. J., Croke, K. G., and Swartzman, D.: 1989, ?Accuracy and Prcision of Home Radon Monitoring and the Effectiveness of EPA Monitoring Guidelines?, JAPCA 39(7), 953?959.
5. Cohen, B. L., and Pondy, P.: 1987, ?Comparison of Purchased Measurements in Randomly Selected Houses as a Source of Information on 222Rn Levels in Houses?, Health Physics 53(4), 409?415.