/**
  * @access public
  * @param \Magento\Catalog\Model\Category $category
  * @return mixed
  */
 public function getSelectedAuthors(CategoryModel $category)
 {
     if (!$category->hasSelectedAuthors()) {
         $authors = [];
         foreach ($this->getSelectedAuthorsCollection($category) as $author) {
             $authors[] = $author;
         }
         $category->setSelectedAuthors($authors);
     }
     return $category->getData('selected_authors');
 }