JQuery :: Blog Entry - How To Toggle Specific Class Element

On my website I have a lot of entries which are similar to blog-entries. Every single entry has about 500 signs and if there are more than there is supposed to be a button "read further"(atm there is no button but later it will be). If the user click this button, the remaining text of the entry is supposed to slide down. My problem is now that I don't know how to slide down just one article. Every article looks like this:

<article class="dark">
<div class="text"><h2>Title</h2> .....
<div class="slide_text"> .....
</div></div>
</article>

But how to slide down only the "slide_text" which belongs to the clicked article. If I use:
$('article').click(function() {
$('.slide_text').slideToggle(200);
});
Every singe "slide_text" of all the entries appears. But this is not, what I want. Is there a way to toggle just the child-slide_text of one entry? Or do I have to give every entry an id to define which entry is supposed to toggle?