@article{ZNSL_1969_16_a8,
     author = {M. I. Kanovitch and B. A. Kushner},
     title = {On an estimation of the complexity of some algorithmic problems of analysis},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {81--90},
     publisher = {mathdoc},
     volume = {16},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1969_16_a8/}
}