References
- Taylor , D. G. , ed. 1977 . NIOSH Manual of Analytical Methods , 2nd ed. , DHEW (NIOSH) Pub. No. 78–175 Vol. 2 , Washington, DC : U.S. Government Printing Office . Method No. S4
- Massart , D. L. , Dijkstra , A. and Kaufman , L. 1978 . Techniques and Instrumentation in Analytical Chemistry, Vol. I, Evaluation and Optimization of Laboratory Methods and Analytical Procedures. A Survey of Statistical and Mathematical Techniques , 1st ed. , New York : Elsevier/ North Holland . Chap. 4
- Hollander , M. and Wolfe , D. A. 1973 . Non-parametric Statistical Methods , New York : John Wiley and Sons . Chap. 6