1. 2005-11-30 [1] [R-sig-Epi] multiple "stairs steps" plots r-sig-epi BXC 2. 2005-11-29 [1] [R-sig-Epi] multiple "stairs steps" plots r-sig-epi Mayelin Mirab 3. 2005-11-11 [2] [R-sig-Epi] Left truncated and right censored data r-sig-epi Thomas Lumley