RT Article T1 An empirical comparison of the validity of UCR and NCS crime rates JF The sociological quarterly VO 21 IS 3 SP 391 OP 401 A1 O'Brien, Robert M. A2 Decker, David L. A2 Shichor, David LA English YR 1980 UL https://krimdok.uni-tuebingen.de/Record/191253522X DO 10.1111/j.1533-8525.1980.tb00620.x