CONCRETE EXAMPLES OF EXISTENCE OF THREE LIMIT CYCLES FOR THE SYSTEM dx/dt=X_2(x,y),dy/dt=Y_2(x,y)
Acta Mathematica Sinica, Chinese Series ›› 1959, Vol. 9 ›› Issue (2) : 213-226.
CONCRETE EXAMPLES OF EXISTENCE OF THREE LIMIT CYCLES FOR THE SYSTEM dx/dt=X_2(x,y),dy/dt=Y_2(x,y)
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