*Vertices 4
1 "中国石油大学学报" 0.0 0.0 0.0 x_fact 5.414013 y_fact 11.337580
2 "石油学报" 0.0 0.0 0.0 x_fact 5.286624 y_fact 26.114650
3 "石油炼制与化工" 0.0 0.0 0.0 x_fact 0.254777 y_fact 5.031847
4 "石油勘探与开发" 0.0 0.0 0.0 x_fact 3.949045 y_fact 57.515924
*Matrix 
0.000000 0.443275 0.221562 0.301806 
0.443275 0.000000 0.000000 0.242766 
0.221562 0.000000 0.000000 0.000000 
0.301806 0.242766 0.000000 0.000000