Nine Papers on Hilbert’s 16th Problem

Author(s):  
D. Gudkov ◽  
G. Utkin
2008 ◽  
Vol 18 (03) ◽  
pp. 877-884 ◽  
Author(s):  
G. LEONOV

Fractionally-quadratic transformations which reduce any two-dimensional quadratic system to the special Lienard equation are introduced. Existence criteria of cycles are obtained.


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