أرسل هذا في رسالة قصيرة: Technical efficiency in rice production at farm level in northern Thailand: A stochastic frontier with maximum entropy approach

   _____   _    _                ___     _    _   
  / ___// | || | ||     ___     / _ \\  | \  / || 
  \___ \\ | || | ||    /   ||  | / \ || |  \/  || 
  /    // | \\_/ ||   | [] ||  | \_/ || | .  . || 
 /____//   \____//     \__ ||   \___//  |_|\/|_|| 
`-----`     `---`       -|_||   `---`   `-`  `-`  
                         `-`