TY - JOUR A1 - Prentice, R.L. A1 - Gloeckler, L.A. T1 - Regression analysis of grouped survival data with applications to breast cancer data Y1 - 1978 DO - 10.2307/2529588 JF - Biometrics VL - 34 IS - 1 SP - 57 EP - -67 ER -