@article{TM_1987_180_a66,
     author = {V. V. Ivanov},
     title = {Optimal precison approximation of functions with singular points unknow in advance},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {120--121},
     year = {1987},
     volume = {180},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a66/}
}