P. 532, line 12

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The equation should be:

\frac{\partial^2 u_{tr}}{\partial x^2} + \frac{\partial^2 u_{ss} }{\partial x^2} + \frac{\partial^2 u_{tr}}{\partial y^2} + \frac{\partial^2 u_{ss} }{\partial y^2} = \frac{\partial u_{tr}}{\partial t} + \frac{\partial u_{ss}}{\partial t}.

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