Researchers defend 20 mph speed limits despite rise in casualties.
London.BMJ (online) (Impact Factor: 16.38). 08/2012; 345:e5580. DOI: 10.1136/bmj.e5580
BMJ (online) 09/2012; 345:e6165. DOI:10.1136/bmj.e6165 · 16.38 Impact Factor
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