1. Underground railway environment in the UK Part 2: investigation of heat load;Ampofo;Applied Thermal Engineering,2004
2. Environment Agency, Underground under threat, the state of groundwater in England and Wales - the state of groundwater report, Available from: http://www.environment-agency.gov.uk/subjects/waterres/groundwater/1463256/.
3. State of the Environment Report for London,2001
4. Gilbey, M.J and Thompson, J., Temperature control on London underground, SME annual meeting, Feb. 22–Feb. 25, 2009, Denver, Co., USA.
5. Ground water cooling;Green;Building Services Journal: the Magazine of CIBSE,2005