@article{Steptoe2011,
author = {Andrew Steptoe and ES. Leigh and Meena Kumari},
title = {Positive affect and distressed affect over the day in older people. },
journal = {Psychology and Ageing},
year = {2011},
month = {Apr},
volume = {26},
number = {4},
pages = {956-65},
url = {},
}