• Weisstein, Eric W., "Minimum", from
MathWorld —a Wolfram Web Resource.
• Kazmierski, Thomas J.,
1995, "Statistical Problem Solving in Quality Engineering", McGraw-Hill,
Inc., New York, NY (pp 48 ff)
• Guimarães, Rui C. and
José A. Sarsfield Cabral, 1997,
«Estatística», McGraw-Hill, Lisboa (pp 40–46). |