@article{DAN_1977_237_5_a6,
     author = {M. I. Yudin},
     title = {Information approach to the problem of recognizing gradation},
     journal = {Doklady Akademii Nauk},
     pages = {1031--1034},
     year = {1977},
     volume = {237},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_5_a6/}
}