Any associate or the personal representative of his estate may transfer, in whole or in part, his interest in an association only to a transferee who is licensed or otherwise legally authorized to render the same kind of professional service which the association was organized to render. If any restrictions are imposed on the right to transfer, the restrictions shall be specifically set forth in the bylaws of the association, and reference to the restriction shall be set forth either generally or specifically on any certificates which evidence ownership in the association.