أرسل هذا في رسالة قصيرة: Spacecraft systems engineering [electronic resource] / edited by Peter Fortescue, Graham Swinerd, John Stark.

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