docs: def _process_book(html_chunk):
      """
      Parse available informations about book from the book details page.
  
      Args:
          html_chunk (obj): HTMLElement containing slice of the page with details.
  
      Returns:
          obj: :class:`structures.Publication` instance with book details.
      """
      title, book_url = _parse_title_url(html_chunk)
  
      # download page with details
      data = DOWNER.download(book_url)
      dom = dhtmlparser.parseString(
          handle_encodnig(data)
      )
      details = dom.find("div", {"id": "kniha_detail"})[0]
  
      # required parameters
      pub = Publication(
          title=title,
          authors=_parse_authors(html_chunk),
          price=_parse_price(details),
          publisher="CPress"
      )
  
      # optional parameters
      pub.optionals.URL = book_url
      pub.optionals.EAN = _parse_ean(details)
      pub.optionals.format = _parse_format(details)
      pub.optionals.pub_date = _parse_date(details)
      pub.optionals.description = _parse_description(details)
  
      return pub