Videos über das Bohren eckiger Löcher
- http://www.youtube.com/watch?v=tqOe2In9ShQ Broca para furo quadrado.wmv
- http://www.youtube.com/watch?v=L5AzbDJ7KYI How to Drill a Square Hole
- http://www.youtube.com/watch?v=S1JH19-JwzA Drilling a square hole! (www.howround.com)
- http://www.youtube.com/watch?v=Acq7Vuy5wNc square hole drilling on a lathe with the Vika attachment
- http://demonstrations.wolfram.com/SquareHoleDrillInThreeDimensions/ Square-Hole Drill in Three Dimensions
- http://mathworld.wolfram.com/ReuleauxTriangle.html --> http://demonstrations.wolfram.com/DrillingASquareHole/
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