RT Article T1 Estimating human trafficking worldwide: a multi-mode strategy JF Forum on crime and society VO 8 IS Special issue SP 1 OP 13 A1 Dijk, J. J. M. van 1947- LA English YR 2015 UL https://krimdok.uni-tuebingen.de/Record/1642164801 K1 Identification of victims of trafficking in human beings K1 Eurostat K1 Cross-country differences K1 Dark number studies K1 Multi-mode strategies