BibTex Entry:

@inproceedings{Xie:2014:PFS:2642918.2647399,
 author = {Xie, Jun and Hertzmann, Aaron and Li, Wilmot and Winnem\"{o}ller, Holger},
 title = {PortraitSketch: Face Sketching Assistance for Novices},
 booktitle = {Proceedings of the 27th Annual ACM Symposium on User Interface Software and Technology},
 series = {UIST '14},
 year = {2014},
 isbn = {978-1-4503-3069-5},
 location = {Honolulu, Hawaii, USA},
 pages = {407--417},
 numpages = {11},
 url = {http://doi.acm.org/10.1145/2642918.2647399},
 doi = {10.1145/2642918.2647399},
 acmid = {2647399},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {creativity support tool, novices, portraits, sketching},
}