@article{MZM_1992_51_1_a6,
     author = {I. E. Gopengauz},
     title = {Pointwise estimate of the error of interpolation with multiple knots at the endpoints of the interval},
     journal = {Matemati\v{c}eskie zametki},
     pages = {55--61},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_1_a6/}
}