00285nam a2200097Ia 4500008004100000082001700041100001900058245005500077260004600132300000900178210430s9999    xx            000 0 und d  a519.2R7881 I  aSheldon M.Ross  aIntroduction to Probability ModelscSheldon M.Ross  aISLAMABADbNational Book Foundationc1972  a755p