@abc.abstractmethod<EOL><INDENT>def get_books_by_genus_type(self, book_genus_type):<DEDENT>
return<EOL>
Gets a ``BookList`` corresponding to the given book genus ``Type`` which does not include books of genus types derived from the specified ``Type``.

        In plenary mode, the returned list contains all known books or
        an error results. Otherwise, the returned list may contain only
        those books that are accessible through this session.

        :param book_genus_type: a book genus type
        :type book_genus_type: ``osid.type.Type``
        :return: the returned ``Book`` list
        :rtype: ``osid.commenting.BookList``
        :raise: ``NullArgument`` -- ``book_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*