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1 "北京大学学报医学版" 0.0 0.0 0.0 x_fact 0.000000 y_fact 19.702602
2 "中日友好医院学报" 0.0 0.0 0.0 x_fact 11.152416 y_fact 13.011152
3 "中国输血杂志" 0.0 0.0 0.0 x_fact 0.000000 y_fact 67.286245
*Matrix 
0.000000 0.872872 0.000000 
0.872872 0.000000 0.436436 
0.000000 0.436436 0.000000