1. Quest for Immortality: Science at Frontiers of Aging;Olshansky,2001
2. National Center for Health Statistics, 2001 Data Warehouse on Trends in Health and Aginghttp://www.senescence.info/definitions.html
3. Towards Healthy Aging-Human Needs and Nursing;Ebersole,2003
4. What Is Life?;Schrodinger,1944
5. Universal biological scaling and mortality.