@article{ZNSL_2015_439_a6,
     author = {Yu. K. Dem'yanovich and D. M. Lebedinskii and N. A. Lebedinskaya},
     title = {Two-sided estimates of some coordinate splines},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {74--92},
     publisher = {mathdoc},
     volume = {439},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_439_a6/}
}