P. 244, line -11

The line should be $\underset{0}{\overset{t}{\int }}{\mathrm{\Xi }}^{-1}(\tau )g(\tau )d\tau =\underset{0}{\overset{t}{\int }}\left[\begin{array}{c}-\frac{1}{2}\\ \frac{1}{2}{e}^{-2\tau }\end{array}\right]$