@article{2013-knowledge-tracing-model,
 title = {A Knowledge Tracing Model of Learning from a Social Tagging System},
 author = {Peter Pirolli AND Sanjay Kairam},
 journal = {User Modeling and User-Adapted Interaction (UMUAI)},
 year = {2013},
 volume = {23},
 number = {2},
 pages = {139--168},
 publisher = {Springer},
 url = {http://idl.cs.washington.edu/papers/knowledge-tracing-model},
}