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https://fr.overleaf.com/learn/latex/Integrals,_sums_and_limits
http://latex.wikia.com/wiki/Sum-class_symbol
https://tex.stackexchange.com/questions/429780/summation-symbol
https://timmurphy.org/2009/08/15/math-summation-symbol-in-latex/
http://thomas-cokelaer.info/blog/2011/04/latex-force-limits-to-appear-above-and-below-the-sum-sign-inline-equation/
http://latex.org/forum/viewtopic.php?t=21301
http://latex.org/forum/viewtopic.php?t=16526
http://latex.org/forum/viewtopic.php?t=17617
https://stackoverflow.com/questions/1471023/latex-how-to-adjust-how-the-sum-symbol-turns-out
http://web.ift.uib.no/Teori/KURS/WRK/TeX/symALL.html
https://www.quora.com/On-Quora-how-do-we-type-the-summation-symbol
https://www.mathworks.com/matlabcentral/answers/10618-display-summation-sign-showing-both-upper-and-lower-limit
https://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/Calculus.html