RT Article T1 A method for determining the size of the underground cash economy for commercial sex in seven US cities A1 Khan, Muhammad Bilal A2 Dombrowski, Kirk A2 Dank, Meredith 1977- A2 Downey, Mitch LA English PB Oxford University Press YR 2016 UL https://krimdok.uni-tuebingen.de/Record/1912621673 DO 10.1093/oxfordhb/9780199915248.013.12