Lattices with Interior and Closure Operators and Abstract Approximation Spaces.

Gianpiero Cattaneo Davide Ciucci Lattices with Interior and Closure Operators and Abstract Approximation Spaces. 67-116 2009 10 T. Rough Sets http://dx.doi.org/10.1007/978-3-642-03281-3_3 journals/trs/2009-10 db/journals/trs/trs10.html#CattaneoC09