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http://journals.cambridge.org/action/displayAbstract?aid=1299056
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ANDREW T. LEE,
EDUARDO RAMOS
and HARRY L. SWINNEY
(2007).
Sedimenting sphere in a variable-gap Hele-Shaw cell. Journal of Fluid Mechanics, 586
,
pp 449-464
doi:10.1017/S0022112007007021