أرسل هذا في رسالة قصيرة: Bidders as Networks and Key Bidders in Online Auctions: A Case of Fine Arts Auctions

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