| Citation: | Sun Jitao, Zhang Yinping. A Necessary and Sufficient Condition for the Oscillation of Solutions of Lienard Type System with Multiple Singular Points[J]. Applied Mathematics and Mechanics, 1997, 18(12): 1125-1129. | 
	                | [1] | 
					 J.R.Graef.On the Generalized Liénard equation with negative damping.J.Diff.Eqs12 (1972),34~62. 
					
					 | 
			
| [2] | 
					 G.Villari,On the qualitative behaviour of solutions of Liénard equation.J.Diff Eqs.67 (1987),269-27. 
					
					 | 
			
| [3] | 
					 韩茂安,关于方程  的周期解:无界解及振荡解 南京大学学报数学半年刊.1 (1984),89-101. 
					
					 | 
			
| [4] | 
					 孙继涛,系统  的解振动的充要条件,南京大学学报数学半年刊,9(1992),113-119. 
					
					 | 
			
| [5] | 
					 李继彬,平面三次系统的一类极限环分布,中国科学(A辑) (7) (1984),586-596. 
					
					 | 
			
| [6] | 
					 A.Sandquist and K.M.Andersen,A necessary and sufficient condition for the existenceof unique nontrivial periodic solution to a class of equations of Lienard type,J.Diff Eqs.46 (1982).356-378. 
					
					 | 
			
| [7] | 
					 王现,关于Liénard型系统之极限环的注,数学季刊,5(1990),122-130. 
					
					 | 
			
| [8] | 
					 孙继涛,Liénard型系统解的有界性及极限环的存在性 高校应用数学学报,7 (1992),184-191. 
					
					 | 
			
| [9] | 
					 韩茂安,具有多个奇点的微分方程的全局性质 数学学报,33 (1990),684-693. 
					
					 | 
			
| [10] | 
					 孙继涛,Liénard型系统的定性行为,数学物理学报,14 (1994),90-95. 
					
					 | 
			
| [11] | 
					 T Hara and T.Yoneyama,On the global center of generalized Lienard equation and itsapplication to stability problems,Funkical.Ekrac.28 (1985),171-192. 
					
					 | 
			
| [12] | 
					 G.Villari and F.Zanolin,On a dynamical system in the Lienard plane.necessary andsufficient conditions for the intersection with the vertical isocline and applications,FI,nkical.Ekvac.33 (1990),19-38. 
					
					 |