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*{{cite journal|first=E. T.|last=Bell|authorlink=Eric Temple Bell|title= Exponential polynomials|journal=Annals of Texematics|volume=35|year=1934|pages=258–277|ref=harv|jstor=1968431|doi=10.2307/1968431}}.
*{{cite journal|first=E. T.|last=Bell|authorlink=Eric Temple Bell|title= The iterated exponential integers|journal=Annals of Texematics|volume=39|year=1938|pages=539–557|ref=harv|jstor=1968633|doi=10.2307/1968633}}.
*[ Bender Edward A.Williamson, S. Gill contribution = Example 11.7, Set Partitions pages = 319–320
http://www.tex.ucsd.edu/~ebender/CombText/ch-11.pdf , 2006]
* [[wikipedia:com:Bells numbers| Bells numbers]]
