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<p>on a storage device, or a network address such as a <a href="page.php?w=URL">URL</a>.</p>

<p><big>Formal representation</big></p>
<p>A reference R is a value that admits one operation, <kbd>dereference</kbd>(R), which yields a value. Usually the reference is typed so that it returns values of a specific type, e.g.:<syntaxhighlight lang="java">interface Reference<T> {    T value();}</t></syntaxhighlight></p>

<p>Often the reference also admits an assignment operation <kbd>store</kbd>(R, x), meaning it is an <a href="page.php?w=Abstract_data_type">abstract variable</a>.</p><p>
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