1 https://de.wikipedia.org/wiki/Transsexualit%C3%A4t
2 Gates, G.: How many people are lesbian, gay, bisexual, and transgender? William Institute, April 2011
   (http://williamsinstitute.law.ucla.edu/wp-cT-Apr-2011.pdf)
3 Beier, K.: Praxisleitfaden Sexualmedizin, Springer Verlag, Berlin, 2011, Seite 51f
4 https://www.gesundheit.gv.at/Portal.Node/ghp/public/content/transsexualitaet-hormonelle-behandlung.html
5 http://www.bmg.gv.at/cms/home/attachments/0/8/8/CH1454/CMS1405604065941/grafik_transsexualismus.pdf
6 http://eva.transgender.at/india/FrauSoli.htm
7 http://matriarchat.info/suedamerika/das-dritte-geschlecht.html
8 http://intersections.anu.edu.au/issue6/schmidt.html
9 https://de.wikipedia.org/wiki/Two-Spirit
10 https://broadly.vice.com/en_us/article/starting-hormones-and-high-school-a-day-in-the-life-of-a-trans-teen
11 http://www.wienerzeitung.at/themen_channel/integration/gesellschaft/721741_Ein-Drittel-der-Transsexuellen-
    von-Gewalt-betroffen.html