The expression of Poisson’s equation (2.1) on page 4 is incorrect. The equation should read:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20161213050837072-0318:S0022377816001185:S0022377816001185_eqn1.gif?pub-status=live)
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Published online by Cambridge University Press: 12 December 2016
The expression of Poisson’s equation (2.1) on page 4 is incorrect. The equation should read: