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Published online by Cambridge University Press: 12 May 2016
In Eq. (22), the x symbol was incorrectly represented by an @ symbol, therefore the equation should correctly read as
\begin{eqnarray*}
\dot x &=& {f_v}(x) + {g_v}(x)u,\\
{y_v} &=& y_v^a(x) - y_v^d(x).
\end{eqnarray*}
Similar errors were also found in the sentence following Eq. (22). In this sentence, the correct math symbol should be yva(x) and yvd(x) instead of yva(@) and yvd(@).