Text this

Number:

Provider:

CAPTCHA:

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

Please enter what you see:

Text this: Unzipping carbon nanotubes into nanoribbons upon oxidation : a first-principles study