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Jan 23, 2017 at 19:39 vote accept Bill J
Jan 23, 2017 at 19:00 comment added Bill J Thanks for pointing me to the right reference. I guess this should be enough for me for the question I really want to solve, even though a more general formula is also desirable, i.e. when the width of a tube is not a constant...
Jan 23, 2017 at 5:53 history answered Ivan Izmestiev CC BY-SA 3.0