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Gorban' A.N., Gorlov A.M., Silantyev V.M.
Limits of the Turbine Efficiency for Free Fluid Flow, Journal of Energy Resources Technology - December 2001 - Volume 123, Issue 4, pp. 311-317.

Recently, five years after publication, this paper remains among top most downloaded articles in the Journal of Energy Resources Technology (see statistics for December 2006 HERE)

This paper is rather popular in Internet. Usually it is cited with a link to http://mystic.math.neu.edu/gorban/Gorlov2001.pdf) and as a paper of Gorlov at al., because A.M. Gorlov is famous engineer, inventor of the Gorlov Helical Turbine.

It is cited by (this list is very incomplete):

http://www.onpedia.com/encyclopedia/wind-turbine

http://www.nationmaster.com/encyclopedia/Offshore-windfarm

http://www.nationmaster.com/encyclopedia/Propeller-wind-generator

http://www.gcktechnology.com/GCK/pg2.html

http://www.esru.strath.ac.uk/EandE/Web_sites/05-06/marine_renewables/technology/hydrodynamics.htm

http://www.esru.strath.ac.uk/EandE/Web_sites/05-06/marine_renewables/envimpact/sif.htm#1

http://www.mantaray.biz/gorlov.html

http://www.ienergyinc.com/windpower.htm

http://www.territoriopc.com/eng/wind_power.php

http://www.netipedia.com/index.php/Wind_power

http://paginas.fe.up.pt/~feliz/e_paper14_DoubleWindTurbine.pdf