@article{Zeng:2012:NRO:2140446.2140457,
 author = {Limin Zeng},
 title = {Non-visual 2D representation of obstacles},
 journal = {SIGACCESS Access. Comput.},
 issue_date = {January 2012},
 number = {102},
 month = jan,
 year = {2012},
 issn = {1558-2337},
 pages = {49--54},
 numpages = {6},
 url = {http://doi.acm.org/10.1145/2140446.2140457},
 doi = {10.1145/2140446.2140457},
 acmid = {2140457},
 publisher = {ACM},
 address = {New York, NY, USA},
}

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