RT Book T1 Validation of a police patrol simulation model T2 The Rand paper series JF P / the Rand Corporation A1 Crabill, Thomas B. A1 Walker, Warren E. A1 Kolesár, Peter LA English PP Santa Monica, Cal. PB Rand Corp. YR 1975 UL https://krimdok.uni-tuebingen.de/Record/109892701X