*Vertices 4
1 "北京大学学报医学版" 0.0 0.0 0.0 x_fact 1.863354 y_fact 10.869565
2 "中华口腔医学杂志" 0.0 0.0 0.0 x_fact 4.347826 y_fact 23.291925
3 "实用口腔医学杂志" 0.0 0.0 0.0 x_fact 20.496894 y_fact 57.142857
4 "口腔正畸学" 0.0 0.0 0.0 x_fact 4.347826 y_fact 8.695652
*Matrix 
0.000000 0.000000 0.000000 0.331786 
0.000000 0.000000 0.438157 0.500475 
0.000000 0.438157 0.000000 0.457805 
0.331786 0.500475 0.457805 0.000000