@article{DAN_1979_249_4_a5,
     author = {V. K. Sabelfeld},
     title = {Polynomial estimation of the complexity of recognizing logical term equivalence},
     journal = {Doklady Akademii Nauk},
     pages = {793--796},
     publisher = {mathdoc},
     volume = {249},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_4_a5/}
}