@article{CMJ_2007__57_2_a5,
     author = {Zhang, Xiaohong and Qin, Keyun and Dudek, Wies{\l}aw A.},
     title = {Ultra $LI${-Ideals} in lattice implication algebras and $MTL$-algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {591--605},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2007},
     mrnumber = {2337617},
     zbl = {1174.03349},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2007__57_2_a5/}
}