1

// http://michalbe.blogspot.com.br/2013/03/javascript-less-known-parts-bitwise.html

2

// http://jsperf.com/bitwise-vs-math-object

3

// http://united-coders.com/christian-harms/results-for-game-for-forfeits-and-the-winner-is/

4

// https://mudcu.be/journal/2011/11/bitwise-gems-and-other-optimizations/

5

// https://dreaminginjavascript.wordpress.com/2009/02/09/bitwise-byte-foolish/