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| 2011 | ||
|---|---|---|
| 2 | Cao Chunhua, Yang Di, Liu Yun: Sub-classes of the monoid of left cancellative languages. Int. J. Comput. Math. 88(8): 1619-1628 (2011) | |
| 2004 | ||
| 1 | Cao Chunhua: The problem of freedom on certain subsemigroups of the submonoid of left singular languages. Int. J. Comput. Math. 81(2): 121-132 (2004) | |
| 1 | Yang Di | [2] |
| 2 | Liu Yun | [2] |
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