@article{VMUMM_1991_6_a19,
     author = {A. Mart{\'\i}nez-Finkelshtein},
     title = {On the rate of rational approximation of the function $\exp(-x)$ on the positive semi-axis},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {94--96},
     year = {1991},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_6_a19/}
}