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Aug 21, 2017 at 20:23 history edited Peter Heinig CC BY-SA 3.0
Added a reference which seems extremely close to what the OP is asking for to the old answer.
Aug 19, 2017 at 22:45 comment added Arrow I mailed the author a few hours ago.
Aug 19, 2017 at 22:43 comment added Dmitri Pavlov That's Zoran Škoda's blog. (Link to the original post: mathlight.wordpress.com/2010/01/07/…)
Aug 19, 2017 at 15:28 history answered Peter Heinig CC BY-SA 3.0