By Sing David   Sing Charles F   in International Journal of Environmental Research and Public Health

ISSN:1660-4601|7|3|1205-1223

MDPI‎(2010)‎

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By Heng Kevin   Hayek Wolfgang   Pont Frédéric   Sing David K.   in Monthly Notices of the Royal Astronomical Society

ISSN:0035-8711|420|1|20-36

Oxford University Press‎(2012)‎

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