York.
Wood, S. N. (2004) Stable and Efficient Multiple Smoothing Parameter Estimation for Generalized Additive Models. <em>Journal of the American Statistical Association</em> <b>99</b>(467): 673–86. <a href="https://doi.org/10.1198/016214504000000980" class="external-link">doi:10.1198/016214504000000980</a></p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># \donttest{</span></span></span