LI Ming-Xia , CHEN Hong-Tao , MAO Shi-Peng . ACCURACY ENHANCEMENT FOR THE SIGNORINI PROBLEM WITH FINITE ELEMENT METHOD[J]. Acta mathematica scientia, Series B, 2011 , 31(3) : 897 -908 . DOI: 10.1016/S0252-9602(11)60284-1

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