@article{MZM_2011_90_5_a9,
     author = {T. Hessami Pilehrood and Kh. Hessami Pilehrood},
     title = {Rational {Approximations} to {Values} of the {Digamma} {Function} and a {Conjecture} on {Denominators}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {744--763},
     publisher = {mathdoc},
     volume = {90},
     number = {5},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_5_a9/}
}