Text this

Number:

Provider:

CAPTCHA:

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

Please enter what you see:

Text this: Controller placement optimization in hierarchical distributed software defined vehicular networks