1. 4 million neonatal deaths: when? where? why?;Lawn;Lancet,2005
2. International Institute for Population Sciences (IIPS) and University of Kerala National Family Health Survey (NFHS-1), India, 1992-93: Kerala 1995
3. International Institute for Population Sciences (IIPS) and University of Kerala National Family Health Survey (NFHS-2), India, 1998-99: Kerala 2001
4. International Institute for Population Sciences (IIPS) and Macro International National Family Health Survey (NFHS-3), India, 2005-06: Kerala 2008