000 00287nam a2200109Ia 4500
100 _aArmitage P & Berry G
250 _aEdn 2
245 _aStatistical Methods in Medical Research .-Edn 2
260 _bBlackwell Sci Pub, Oxford
082 _aL:(B28)/N90/B18010
300 _app 559; 24*16
999 _c33916
_d33916