The equation 11.14 in Chapter 11, page 393 is incorrect. The correct equation is shown below:

$$\begin{array}{llllll} {{Q_{{11}}} = {\frac{{{S_{{22}}}}}{{{S_{{11}}}{S_{{12}}} - S_{{22}}^2}} },} \cr {{Q_{{12}}} = - \frac{{{S_{{12}}}}}{{{S_{{11}}}{S_{{22}}} - S_{{12}}^2}},} \cr {{Q_{{22}}} = \frac{{{S_{{11}}}}}{{{S_{{11}}}{S_{{22}}} - S_{{12}}^2}},} \cr {{Q_{{66}}} = \frac{1}{{{S_{{66}}}}}.} \end{array}$$
(11.14)