發送短信 : A study on bid-ask spread patterns of Nikkei 225 stock index futures traded on SGX-DT and OSE.

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