Django REST Framework refer to own class in relation

I have an article model which has a many-to-many relationship with itself:

class Article(models.Model):
  title = models.CharField(max_length=200)
  authors = models.ManyToManyField(User)
  abstract = models.TextField(max_length=2000, blank=True)
  full_text = models.TextField(blank=True)
  section = models.ManyToManyField(ArticleSection, null=True)
  references = models.ManyToManyField(ArticleReferences, null=True)
  related_articles = models.ManyToManyField("self", null=True)

  def __unicode__(self):
      return self.title

This is for the related_articles field. How would I do this same sort of login in the rest-framework?

class ArticleSerializer(serializers.HyperlinkedModelSerializer):
  authors = AuthorSerializer(many=True,  read_only=True)
  section = ArticleSectionSerializer(many=True,  read_only=True)
  related_articles = ArticleSerializer(many=True,  read_only=True)
  class Meta:
      model = Article
      fields = (
              'title',
              'authors',
              'abstract',
              'full_text',
              'section',
              'related_articles'
              )

I receive an error for ArticleSerializer not being defined. How would I implement the related articles field?