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[128] http://en.wikipedia.org/wiki/Golden_angle
[129] http://oeis.org/wiki/Centered_polygonal_numbers
[130] http://www.virtuescience.com/centered-polygonal.html
[131] http://en.wikipedia.org/wiki/Centered_number
[132] http://mathworld.wolfram.com/CenteredPolygonalNumber.html
[133] http://oeis.org/wiki/Platonic_numbers
[134] http://mathworld.wolfram.com/FigurateNumber.html
[135] http://en.wikipedia.org/wiki/Category:Figurate_numbers
[136] http://en.wikipedia.org/wiki/Figurate_number
[137] http://en.wikipedia.org/wiki/Polygonal_number
[138] http://mathworld.wolfram.com/FigurateNumber.html
[139] http://oeis.org/wiki/User:Peter_Luschny/FigurateNumber
[140] http://www.whatabeginning.com/ASPECTS/ASPECTS_FN.htm
[141] http://bbs.sachina.pku.edu.cn/stat/math_world/math/f/f132.htm
[142] http://www.biblewheel.com/GR/GR_Figurate.php
[143] https://hu.wikipedia.org/wiki/Venn-diagram
[144] https://en.wikipedia.org/wiki/Euler_diagram#History
[145]
http://matekold.fazekas.hu/portal/tanitasianyagok/Orosz_Gyula/Rek/rek3.ht
ml
[146] https://archive.org/details/symboliclogic00venniala
[147] http://www.combinatorics.org/files/Surveys/ds5/VennEJC.html
[148] https://en.wikipedia.org/wiki/Branko_Gr%C3%BCnbaum
[149] http://www.archimedes-lab.org/tangramagicus/
[150] http://mathworld.wolfram.com/Stomachion.html
[151] http://ro.wikipedia.org/wiki/Manuscrisul_lui_Arhimede
[152]
https://commons.wikimedia.org/wiki/File:Venn%27s_four_ellipse_constructio
n.png
[153]
http://webhome.cs.uvic.ca/~ruskey/Publications/VennConvex/VennKgons.pdf
[154] http://hu.wikipedia.org/wiki/Venn-diagram
[155]https://kupdf.net/download/matematica-pentru-grupele-de-
performanta-clasa-a-xi-a_5904c149dc0d600b65959e7b_pdf
[156] http://hu.wikipedia.org/wiki/Matematikai_k%C3%B6zepek
[157] www.math.ku.dk/~mel/mel.pdf
[158] https://matkonyv.fazekas.hu/chapter.php?mode=tnehstj-
&volume=k_i&code=K.I&chapter=chs_k_i/k_i_skatulya&chapternum=8&topic=
Kombinatorika&yearpair=7--8
[159] https://www.youtube.com/watch?v=0j3USFK2md0
[160] https://adoc.pub/a-skatulya-elv-beres-zoltan-szabadka-zenta.html.

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