The following formula is involved in the calculation of upper incomplete gamma function values:
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Upper incomplete gamma function:

where x is the lower limit of integration and s is the value of the shape parameter.
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The following references can be used to cite this upper incomplete gamma function calculator:
 | Soper, D.S. (2013). Upper Incomplete Gamma Function Calculator [Software]. Available from http://www.danielsoper.com/statcalc |
 | Abramowitz, M. and Stegun, I.A., eds. (1965). Handbook of Mathematical Functions. New York, NY: Dover. |