Text this: Effects of single and double filling in skutterudites for thermoelectric applications

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