Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 22 references without a DOI — listed, not checked
no DOI — not checkedAllen DJ, Brewerton LJ, Coleby LM, Gibbs BR, Lewis MA, Macdonald AM, Wagstaff SJ, Williams AT (1997) The physical properties of major aquifers in England and Wales. British Geological Survey Technical Report (WD/97/34). Environment Agency R&D Publication, vol 8, Keyworth, UK
no DOI — not checkedAnon. (1994). The microbiology of water 1994 Part 1-Drinking water. HMSO, London
no DOI — not checkedBrown IT, Rushton KR (1993) Modelling of the Doncaster Aquifer. School of Civil Engineering, University of Birmingham, Birmingham, UK
no DOI — not checkedBuckley DK (2003) Pesticides in the Triassic Sandstone aquifer of South Yorkshire: interpretation of borehole geophysical logging. British Geological Survey Commissioned Report, CF/03/071C
no DOI — not checkedCronin AA, Rueedi J, Morris BL (2005) The effectiveness of selected microbial and chemical indicators to detect sewer leakage impacts on urban groundwater quality. Proceedings of the 10th International Conference on Urban Drainage, Copenhagen, Denmark, 21–26 August 2005
no DOI — not checkedEiswirth M, Hötzl H (1994) Groundwater contamination by leaky sewer systems. In: Water down under, National conference of Institution of Engineeers, Adelaide, Australia, pp 111–114, November 1994
no DOI — not checkedEiswirth M, Hötzl H, Cronin AA, Morris BL, Veselic M, Bufler R, Burn S, Dillon P (2002) Assessing and improving the sustainability of urban water resources and systems. In: Proceedings of the Image-Train Cluster Meeting Cracow, Poland. October 2002. Accessible at http://www.urbanwater.de
no DOI — not checkedGaunt GD (1994) Geology of the country around Goole, Doncaster and the Isle of Axholme. British Geological Survey, London
no DOI — not checkedHöhener P, Werner D, Balsiger C, Pasteris G (2002) Occurence and fate of chlorofluorocarbon plumes in groundwater. In: Thornton SF, Oswald SE (eds) Groundwater quality: natural and enhanced restoration of groundwater pollution. IAHS Publ. No. 275, pp 41–47
no DOI — not checkedLerner DN, Issar SI, Simmers I (1990) Recharge due to urbanisation, from ‘Groundwater Recharge, A guide to understandingand estimating natural recharge’. International Contributions to Hydrogeology, vol 8. IAH, Verlag Heinz Heise, Hannover, Germany
no DOI — not checkedMorris BL, Stuart ME, Cronin AA (2003) Assessing and improving sustainability of urban water resources and systems: AISUWRS work-package 1 background study. CR/03/052C, British Geological Survey, Keyworth, Nottingham, UK
no DOI — not checkedMorris BL, Darling WG, Gooddy DC, Litvak RG, Neumann I, Nemaltseva EJ, Poddubnaia I (2005) Assessing the extent of induced leakage to an urban aquifer using environmental tracers: an example from Kyrgyzstan, Central Asia. Hydrogeol J 14(1–2):225–243
no DOI — not checkedNational Oceanic and Atmospheric Administration, Earth System Research Laboratory (NOAA-ESRL). (2005) Website: http://www.cmdl.noaa.gov/ . Accessed 8 December
no DOI — not checkedNeumann I, Hughes A (2003) Translation of the Doncaster groundwater model into the MODFLOW code. British Geological Survey Commissioned Report, CR/03/258N. 27 pp
no DOI — not checkedOster H (1994) Datierung von Grundwasser mittels FCKW: Voraussetzungen, Möglichkeiten und Grenzen (Dating groundwaters with CFCs: assumptions, possibilities and limitations)—Dissertation, Universität Heidelberg
no DOI — not checkedPlummer LN, Busenberg E (1999) Chlorofluorocarbons. In: Cook PG, Herczeg AL (eds) Environmental tracers in subsurface hydrology. Kluwer, Dordrecht, The Netherlands, pp 441–478
no DOI — not checkedRueedi J, Cronin AA (2003) Construction of 5 depth specific groundwater sampling sites in Doncaster, UK. Robens Centre for Public and Environmental Health, Guildford, UK
no DOI — not checkedRueedi J, Cronin AA, Morris BL (2004) Assessing and improving sustainability of urban water resources and systems: Work-package 4: Field investigations interim report. British Geological Survey Commissioned Report, 72 pp
no DOI — not checkedSmedley PL, Brewerton LJ (1997) The natural (baseline) quality of groundwater in England and Wales. Part 2: the Triassic Sherwood Sandstone of the East Midlands and South Yorkshire. British Geological Survey Technical Report WD/97/52. BGS Keyworth, England
no DOI — not checkedStanding Committee of Analysts (SCA) (1995) Methods for the isolation and identification of human enteric viruses from waters and associated materials. Methods for the examination of waters and associated materials. HMSO, London
no DOI — not checkedUniversity of Karlsruhe, Dept of Applied Geology (2005) AISUWRS—Assessing and improving the sustainability of urban water resources and systems, Website http://www.urbanwater.de . Accessed 8 December
no DOI — not checkedVan Ryneveld MB, Fourie AB (1997) A strategy for evaluating the environmental impact of on-site sanitation systems. Water SA 23:279–291
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