docs: def _parse_authors(html_chunk):
      """
      Parse authors of the book.
  
      Args:
          html_chunk (obj): HTMLElement containing slice of the page with details.
  
      Returns:
          list: List of :class:`structures.Author` objects. Blank if no author \
                found.
      """
      authors = html_chunk.match(
          ["div", {"class": "comment"}],
          "h3",
          "a",
      )
  
      if not authors:
          return []
  
      authors = map(
          lambda x: Author(                            # create Author objects
              x.getContent().strip(),
              normalize_url(BASE_URL, x.params.get("href", None))
          ),
          authors
      )
  
      return filter(lambda x: x.name.strip(), authors)