Modeling problem difficulty and expertise in stackoverflow. Hanrahan, B. V., Convertino, G., & Nelson, L. In pages 91–94, February, 2012. ACM.
Modeling problem difficulty and expertise in stackoverflow [link]Paper  doi  bibtex   
@inproceedings{hanrahan_modeling_2012,
	title = {Modeling problem difficulty and expertise in stackoverflow},
	isbn = {978-1-4503-1051-2},
	url = {http://dl.acm.org/citation.cfm?id=2141512.2141550},
	doi = {10.1145/2141512.2141550},
	urldate = {2019-04-26},
	publisher = {ACM},
	author = {Hanrahan, Benjamin V. and Convertino, Gregorio and Nelson, Les},
	month = feb,
	year = {2012},
	pages = {91--94},
}

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