1. Leland, O.M., Practical Least Squares, McGraw-Hill, New York, NY (1921)
2. Sears, F. W., and Zemansky, M. W., College Physics, Part I, Mechanics, Heat, and Sound, Addison Wesley, Cambridge, MA (1952), p. 59
3. Dally, J.W., and Riley, W.F., “Experimental Stress Analysis”, McGraw-Hill, New York, NY (1978), Chapter 10
4. Hamming, R. W., Numerical Methods for Scientists and Engineers, McGraw-Hill, New York, NY (1962), p. 244–246
5. Ibid, p. 361,362