LU Shi-Ping , ZHENG Liang , CHEN Li-Juan . HOMOCLINIC SOLUTIONS FOR A CLASS OF SECOND ORDER NEUTRAL FUNCTIONAL DIFFERENTIAL SYSTEMS[J]. Acta mathematica scientia, Series B, 2013 , 33(5) : 1361 -1374 . DOI: 10.1016/S0252-9602(13)60087-9

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