https://books.google.com.my/books?id=_tnC5UxkeukC&pg=PA226&dq=kliau+shield&hl=en&sa=X&ved=2ahUKEwiby-XTr_jzAhWhwjgGHaFLA_oQ6AF6BAgFEAI#v=onepage&q=kliau%20shield&f=false