* https://developer.mozilla.org/de/docs/Web/JavaScript/Guide/Grammatik_und_Typen#Numerische_Literale
  * https://wiki.selfhtml.org/wiki/JavaScript/Objekte/Number
  * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type
  * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
  * http://webkompetenz.wikidot.com/html-handbuch:ecmascript-sprachbestandteile#toc11