Rough approximations via ideal on a complete completely distributive lattice
2006 ◽
Vol 176
(13)
◽
pp. 1829-1848
◽
1985 ◽
Vol 32
(3)
◽
pp. 361-374
◽
1975 ◽
Vol 59
(1)
◽
pp. 43-67
◽
1976 ◽
Vol 63
(1)
◽
pp. 247-253
◽
2007 ◽
Vol 27
(1)
◽
pp. 109
1990 ◽
Vol 50
(2)
◽
pp. 185-196
◽