*Vertices 4
1 "清华大学学报" 0.0 0.0 0.0 x_fact 2.652520 y_fact 24.933687
2 "水力发电" 0.0 0.0 0.0 x_fact 7.957560 y_fact 20.159151
3 "水利学报" 0.0 0.0 0.0 x_fact 6.631300 y_fact 41.379310
4 "水利水电技术" 0.0 0.0 0.0 x_fact 8.753316 y_fact 13.527851
*Matrix 
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