Rough operations on Boolean algebras

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\begin{bibtex} @article{DBLP:journals/isci/QiL05,

 author    = {Guilin Qi and
              Weiru Liu},
 title     = {Rough operations on Boolean algebras},
 journal   = {Inf. Sci.},
 volume    = {173},
 number    = {1-3},
 year      = {2005},
 pages     = {49-63},
 ee        = {http://dx.doi.org/10.1016/j.ins.2004.06.006},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}