@article{IM2_1984_23_3_a2,
     author = {M. M. Dzhrbashyan and V. M. Martirosyan},
     title = {Integral representations and best approximation by generalized polynomials in systems of {Mittag-Leffler} type},
     journal = {Izvestiya. Mathematics },
     pages = {449--471},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1984_23_3_a2/}
}