Understanding the Value of VGI. Feick, R. & Roche, S. Crowdsourcing geographic knowledge, 2013.
Understanding the Value of VGI [link]Website  bibtex   
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 title = {Understanding the Value of VGI},
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 year = {2013},
 websites = {http://link.springer.com/chapter/10.1007/978-94-007-4587-2_2},
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 author = {Feick, R and Roche, S},
 journal = {Crowdsourcing geographic knowledge}
}

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