@classmethod
def _register(cls, registerCls):
    """
        Decorator to register Entry type classes.

        :param registerCls: class to register
        :type registerCls: class
        :return: class to register
        :rtype: class
        """
    type_name = registerCls.BibTeXType
    cls._registeredTypes[type_name] = registerCls
    return registerCls
