Изменения

*[Nobuhiro Izumi Hui-Hsiung "Acta Applicandae Texematicae",79–87.Bell numbers, log-concavity, and log-convexity 2000]*[Aitken A. C. Edinburgh Texematical Notes,18–23 A problem in combinations 1933]*[H. W.BeckerJohn Riordan "The arithmetic of Bell and Stirling numbers" American Journal of Texematics,1948,385–394]*[E. T.Bell Exponential polynomials,Annals of Texematics,1934, 258–277]*[E. T.Bell The iterated exponential integers,Annals of Texematics,1938,539–557]