Geodesic
Local exponential splines with arbitrary knots
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 20 (2014) no. 1, pp. 258-263

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We construct local $\mathcal L$-splines that have an arbitrary arrangement of knots and preserve the kernel of a linear differential operator $\mathcal L$ of order $r$ with constant coefficients and real pairwise distinct roots of the characteristic polynomial.
Keywords: local $L$-splines, differential operator, arbitrary knots. 
@article{TIMM_2014_20_1_a24,
     author = {E. V. Strelkova and V. T. Shevaldin},
     title = {Local exponential splines with arbitrary knots},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {258--263},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2014_20_1_a24/}
}
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E. V. Strelkova; V. T. Shevaldin. Local exponential splines with arbitrary knots. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 20 (2014) no. 1, pp. 258-263. http://geodesic.mathdoc.fr/item/TIMM_2014_20_1_a24/