https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwjbyYrTuu7mAhWZyosBHWSLATYQFjAAegQIARAC&url=http%3A%2F%2Fwww.ith.sinica.edu.tw%2Fquarterly_download.php%3Fname%3Dfulltext_16_2_3%25E5%2585%25A8%25E6%2596%2587.pdf%26filename%3D125930484622.pdf&usg=AOvVaw3VruqSSAe3GFmZDHl3rwrI