@article{MaMe07,
 author = {Manea, Florin and Merca\c{s}, Robert},
 title = {Freeness of partial words},
 journal = {Theoretical Computer Science},
 volume = {389},
 number = {1-2},
 year = {2007},
 issn = {0304-3975},
 pages = {265--277},
 doi = {http://dx.doi.org/10.1016/j.tcs.2007.09.028},
 publisher = {Elsevier Science Publishers Ltd.},
 address = {Essex, UK},
}