293595
For the case of flutter analysis , lift history for the motion obtained from the Wagner analysis ( Herbert A. Wagner ) with varying frequecy of oscillation shows that magnitude of lift decreases and a phase lag develops between the aircraft motion and the unsteady aerodynamic forces .
 Wagner, Herbert A. Wagner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Wagner, Herbert A. Wagner