TY - JOUR AU - van Eck, N J; Waltman, L TI - Software survey: VOSviewer, a computer program for bibliometric mapping JO - Scientometrics IS - 02 VL - 84 PY - 2010 DO - 10.1007/s11192-009-0146-3 L3 - PubMed-ID: 20585380 SP - 523 EP - 38 ER -