https://jech.bmj.com/content/jech/61/8/681.full.pdf
Greenspace, urbanity and health: relationships in England, Richard Mitchell and Frank Popham, Journal of epidemiology and community health [archive] 2007; 61: 681-683
Greenspace, urbanity and health: relationships in England, Richard Mitchell and Frank Popham, Journal of epidemiology and community health [archive] 2007; 61: 681-683