 PDF(433 KB)
						
							PDF(433 KB) 
						
						
					 
			 PDF(433 KB)
						
							PDF(433 KB) 
						
						
					 PDF(433 KB)
						
							PDF(433 KB) 
						
						
					再论一类二次系统的无界双中心周期环域的Poincare分支
STUDY ON THE POINCARE BIFURCATION OF QUADRATIC SYSTEM WITH TWO CENTERS AND TWO UNBOUNDED HETEROCLINIC LOOPS ONCE AGAIN
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