*Vertices 9
1 "石油大学学报" 0.0 0.0 0.0 x_fact 2.630444 y_fact 5.950841
2 "西南石油学院学报" 0.0 0.0 0.0 x_fact 4.139715 y_fact 6.166451
3 "石油钻采工艺" 0.0 0.0 0.0 x_fact 3.708495 y_fact 5.950841
4 "钻井液与完井液" 0.0 0.0 0.0 x_fact 1.509271 y_fact 3.837861
5 "石油机械" 0.0 0.0 0.0 x_fact 1.078051 y_fact 7.373868
6 "石油钻探技术" 0.0 0.0 0.0 x_fact 3.147909 y_fact 10.909875
7 "石油学报" 0.0 0.0 0.0 x_fact 4.872790 y_fact 12.462268
8 "天然气工业" 0.0 0.0 0.0 x_fact 3.191031 y_fact 6.382061
9 "石油勘探与开发" 0.0 0.0 0.0 x_fact 5.778353 y_fact 40.965934
*Matrix 
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0.294915 0.000000 0.464921 0.257786 0.000000 0.000000 0.460489 0.732552 0.429734 
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0.215968 0.429734 0.279788 0.000000 0.000000 0.000000 0.394232 0.246907 0.000000