Geodesic
Two-sided estimates of some coordinate splines
Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXVIII, Tome 439 (2015), pp. 74-92

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Two-sided estimates of continuously differentiable coordinate splines of the second order are established, and sufficient conditions of their nonnegativeness are provided. The results obtained are applied to trigonometric splines. 
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     author = {Yu. K. Dem'yanovich and D. M. Lebedinskii and N. A. Lebedinskaya},
     title = {Two-sided estimates of some coordinate splines},
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     pages = {74--92},
     publisher = {mathdoc},
     volume = {439},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_439_a6/}
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Yu. K. Dem'yanovich; D. M. Lebedinskii; N. A. Lebedinskaya. Two-sided estimates of some coordinate splines. Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms. Part XXVIII, Tome 439 (2015), pp. 74-92. http://geodesic.mathdoc.fr/item/ZNSL_2015_439_a6/