أرسل هذا في رسالة قصيرة: Dependence structure between world crude oil prices: Evidence from NYMEX, ICE, and DME markets

  _____      ___     _    _      ___      ______  
 / ____||   / _ \\  | |  | ||   / _ \\   /_   _// 
/ //---`'  | / \ || | |/\| ||  | / \ ||    | ||   
\ \\___    | \_/ || |  /\  ||  | \_/ ||   _| ||   
 \_____||   \___//  |_// \_||   \___//   /__//    
  `----`    `---`   `-`   `-`   `---`    `--`