20130425:Volume Zone Oscillator(VZO)

AmiBroker 1: http://howtotradeinequity.blogspot.tw/2011/04/volume-zone-oscillator.html
Wealth-Lab: http://www2.wealth-lab.com/WL5Wiki/TASCMay2011.ashx
Resource Center: http://team.thinkorswim.com/manual/dark/studies/studies%20library/V-Z/VolumeZoneOscillator.html
AmiBroker 2: http://www.traders.com/index.php/sac-magazine/departments/traders-tips/748-amibroker-volume-zone-oscillator
IFTA 2009 (p.18):  http://www.docstoc.com/docs/74493438/IFTA-2009
Document download: https://docs.google.com/file/d/0B_U6gg0gVkXEWE9aYmJCZTM5ZUE/edit?usp=sharing