http://refractivethinker.com/authors/dr-les-paull/ https://www.researchgate.net/profile/Les_Paull https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DLxryqj4NqCA&ved=2ahUKEwj9h6iHo_LoAhWyoFsKHRslCnsQjjgwBnoECAkQAQ&usg=AOvVaw3nXcT_Hnm9ItyStvYnq1h_&cshid=1587223168256