01 – http://www.fastcodesign.com/1663137/how-3m-gave-everyone-days-off-and-created-an-innovation-dynamo
02 – https://hbr.org/2013/08/the-innovation-mindset-in-acti-3/
03 – https://www.google.co.il/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=3m%2015%25%20rule