Integral manifolds of differential equations with rapidly rotating phase

1969 ◽  
Vol 12 (11) ◽  
pp. 1243-1252 ◽  
Author(s):  
A. S. Gurtovnik ◽  
Yu. I. Neimark
1997 ◽  
Vol 61 (2) ◽  
pp. 258-261
Author(s):  
A. B. Shapoval

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