TY - JOUR T1 - JO - Scientometrics UR - http://dx.doi.org/10.1023/a:1024189702463 PY - 2003/01/01 AU - Li X ED - DO - DOI: 10.1023/a:1024189702463 PB - Springer Science and Business Media LLC VL - 57 IS - 2 SP - 239 EP - 255 Y2 - 2024/12/28 ER -