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http://journals.cambridge.org/action/displayAbstract?aid=2052344
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CURTIS W. HAMMAN,
JOSEPH C. KLEWICKI
and ROBERT M. KIRBY
(2008).
On the Lamb vector divergence in Navier–Stokes flows. Journal of Fluid Mechanics, 610
,
pp 261-284
doi:10.1017/S0022112008002760