get_pages by slug

Hello,

I want to get certain pages, I can do this by the code below, but is it also possible to do this by a slug? So when I delete the page I do not have to modify the code?

<?php
	$mypages = get_pages( array( 'include' => '220', 'sort_column' => 'post_date', 'sort_order' => 'desc' ) );

	foreach( $mypages as $page ) {
		$content = $page->post_content;
		if ( ! $content ) // Check for empty page
			continue;

		$content = apply_filters( 'the_content', $content );
	?>
		<h2><a href="<?php echo get_page_link( $page->ID ); ?>"><?php echo $page->post_title; ?></a></h2>
		<div class="entry"><?php echo $content; ?></div>
	<?php
	}
?>