@article{AL_1982_21_2_a2,
     author = {Ya. M. Drugush},
     title = {Union of logics modeled by finite trees},
     journal = {Algebra i logika},
     pages = {149--161},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1982_21_2_a2/}
}