ferences<a class="anchor" aria-label="anchor" href="#references"></a></h2>
    <p>Zhang X, Sun S, Yong S, et al. (2007). <em>Vegetation map of the People's Republic of China (1:1000000)</em>. Geology Publishing House, Beijing.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="kw">if</span> <span class="op">(</s