@INPROCEEDINGS{
alt-nordichi10-crowdsourcing, 
author = {Alt, Florian and Shirazi, Alireza Sahami and Schmidt, Albrecht and Kramer, Urs and Nawaz, Zahid}, title = {{Location-based Crowdsourcing: Extending Crowdsourcing to the Real World}}, 
booktitle = {Proceedings of the Sixth Nordic Conference on Human-Computer Interaction: Extending Boundaries}, 
year = {2010}, 
series = {NordiCHI '10}, 
pages = {13--22}, 
address = {New York, NY, USA}, 
month = {oct}, 
publisher = {ACM}, 
acmid = {1868921}, 
doi = {10.1145/1868914.1868921}, 
isbn = {978-1-60558-934-3}, 
journal = {Proceedings of the Sixth Nordic Conference on Human-Computer Interaction: Extending Boundaries}, 
keywords = {context, crowdsourcing, location, mobile phone}, 
location = {Reykjavik, Iceland}, 
numpages = {10}, 
timestamp = {2010.10.01}, 
url = {http://doi.acm.org/10.1145/1868914.1868921} 
}