*Vertices 2
1 "卫生研究" 0.0 0.0 0.0 x_fact 4.268293 y_fact 54.268293
2 "环境与健康杂志" 0.0 0.0 0.0 x_fact 15.243902 y_fact 45.731707
*Matrix 
0.000000 0.521670 
0.521670 0.000000