@article{MZM_1987_42_4_a1,
     author = {I. E. Shparlinski},
     title = {Number of different prime divisors of recurrence sequences},
     journal = {Matemati\v{c}eskie zametki},
     pages = {494--507},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_4_a1/}
}