TY - CONF T1 - Is the higher citation of collaborative research the same in every country: A case study of economics JO - 12th International Conference on Scientometrics and Informetrics, ISSI 2009 PY - 2009/01/01 AU - Levitt JM AU - Thelwall M AU - Oppenheim C ED - SP - 759 EP - 763 Y2 - 2025/04/09 ER -