@article{TRSPY_2013_283_a17,
     author = {E. P. Ushakova},
     title = {Upper estimates for the approximation numbers of the generalized {Laplace} transform},
     journal = {Informatics and Automation},
     pages = {267--287},
     publisher = {mathdoc},
     volume = {283},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2013_283_a17/}
}