adding html css class atribute to archive links

Hi guys,
for one custom theme what i am developing,

What do i have to do in order to get <a>class="archive_link" ...> instead of <a ...> from the wp_get_archives function for an aside widget?
In functions.php i have this:

function sxo_widgets_init() {
    register_sidebar( array(
        'name' => __( 'Primary Widget Area', 'sabercomer' ),
        'id' => 'sidebar-1',
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget' => '</aside>',
        'before_title' => '<h1 class="widget-title">',
        'after_title' => '</h1>'
    ) );
add_action( 'widgets_init', 'sxo_widgets_init' );

And in aside.php template i have:

...
<ul>
    <?php wp_get_archives( array( 'type' => 'monthly') ); ?>
</ul>
...

thanks in advance,

snor512

[Moderator Note: No bumping, thank you.]