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2 "牙体牙髓牙周病学杂志" 0.0 0.0 0.0 x_fact 10.996564 y_fact 27.319588
3 "实用口腔医学杂志" 0.0 0.0 0.0 x_fact 13.745704 y_fact 34.020619
4 "临床口腔医学杂志" 0.0 0.0 0.0 x_fact 16.838488 y_fact 25.085911
*Matrix 
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0.448318 0.453564 0.000000 0.663943 
0.639647 0.696757 0.663943 0.000000