@article{AL_2012_51_2_a3,
     author = {A. V. Karpenko},
     title = {Interpolation in weakly transitive modal logics},
     journal = {Algebra i logika},
     pages = {197--215},
     year = {2012},
     volume = {51},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2012_51_2_a3/}
}