Geodesic
Natural histospline
Matematičeskoe modelirovanie, Tome 15 (2003) no. 9, pp. 49-54.

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Histospline methods are considered. Natural histospline is proposed for approximation of a density function. Alternative methods are examined including methods providing density to be positive. Methods are illustrated with data on income distribution in Russia. 
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N. M. Shlyakhov. Natural histospline. Matematičeskoe modelirovanie, Tome 15 (2003) no. 9, pp. 49-54. http://geodesic.mathdoc.fr/item/MM_2003_15_9_a3/

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