@article{TRSPY_1958_52_a5,
     author = {G. S. Tseitin},
     title = {An associative calculus with an insoluble problem of equivalence},
     journal = {Informatics and Automation},
     pages = {172--189},
     publisher = {mathdoc},
     volume = {52},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1958_52_a5/}
}