@article{ZNSL_1979_88_a2,
     author = {D. Yu. Grigor'ev},
     title = {Time bounds of multidimensional {Turing} machines},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {47--55},
     publisher = {mathdoc},
     volume = {88},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_88_a2/}
}