@article{MZM_1987_42_2_a17,
     author = {S. N. Smirnov},
     title = {Recurrence of absolute-difference chains},
     journal = {Matemati\v{c}eskie zametki},
     pages = {336--342},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_2_a17/}
}