Editing Hydrodynamical helicity (section)

==References==

* [[George Batchelor|Batchelor, G.K.]], (1967, reprinted 2000) ''An Introduction to Fluid Dynamics'', Cambridge Univ. Press
* Ohkitani, K., "''Elementary Account Of Vorticity And Related Equations''". Cambridge University Press. January 30, 2005. {{ISBN|0-521-81984-9}}
* [[Alexandre Chorin|Chorin, A.J.]], "''Vorticity and Turbulence''". Applied Mathematical Sciences, Vol 103, Springer-Verlag. March 1, 1994. {{ISBN|0-387-94197-5}}
* [[Andrew Majda|Majda, A.J.]] & Bertozzi, A.L., "''Vorticity and Incompressible Flow''". Cambridge University Press; 1st edition. December 15, 2001. {{ISBN|0-521-63948-4}}
* [[David Tritton|Tritton, D.J.]], "''Physical Fluid Dynamics''". Van Nostrand Reinhold, New York. 1977. {{ISBN|0-19-854493-6}}
* Arfken, G., "''Mathematical Methods for Physicists''", 3rd ed. Academic Press, Orlando, FL. 1985. {{ISBN|0-12-059820-5}}
*[[Keith Moffatt|Moffatt, H.K.]] (1969) The degree of knottedness of tangled vortex lines. ''J. Fluid Mech''. '''35''', pp.&nbsp;117–129.
*[[Keith Moffatt|Moffatt, H.K.]] & [[Renzo L. Ricca|Ricca, R.L.]] (1992) Helicity and the Cǎlugǎreanu Invariant. ''Proc. R. Soc. Lond. A'' '''439''', pp.&nbsp;411–429.
*[[William Thomson, 1st Baron Kelvin|Thomson, W. (Lord Kelvin)]] (1868) On vortex motion. ''Trans. Roy. Soc. Edin.'' '''25''', pp.&nbsp;217–260.

{{Meteorological variables}}

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[[Category:Fluid dynamics]]