See gamma distribution in All languages combined, or Wiktionary
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"ref": "1988, A. Clifford Cohen, Betty Jones Whitten, Parameter Estimation in Reliability and Life Span Models, Marcel Dekker, page 93:",
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"text": "1999 [1977, Wiley], Jean Dickinson Gibbons, Ingram Olkin, Milton Sobel, Selecting and Ordering Populations: A New Statistical Methodology, SIAM, Republished unabridged and corrected, page 328,\nThe ranking and selection problems in this chapter apply to populations that follow the gamma distribution. The gamma distribution model is used widely in many fields of applications, particularly in engineering and the social and physical sciences."
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"ref": "2005, M. T. Todinov, Reliability and Risk Models: Setting Reliability Requirements, Wiley, page 36:",
"text": "The negative exponential distribution is a special case of the gamma distribution in which k#x3D;1. Another important special case of a gamma distribution with parameters k and #x5C;theta#x3D;2 is the χ² distribution G(k,2) with n#x3D;2k degrees of freedom.[…]Gamma distributions have an additivity property: the sum of two random variables following gamma distributions G(k#x5F;1,#x5C;theta) and G(k#x5F;2,#x5C;theta) is a random variable following a gamma distribution G(k#x5F;1#x2B;k#x5F;2,#x5C;theta) with parameters k#x5F;1#x2B;k#x5F;2 and #x5C;theta[…].",
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