Joomla 3获取文章网址

i created a tiny module which displays short article description. For read more link i used this:

<?php echo $r->readmore_link = JRoute::_(ContentHelperRoute::getArticleRoute($r->id, $r->catslug)); ?>

It worked fine in joomla 2.5, but it doesn't work in joomla3

What is the best way to display link to a article?

Thank you