Geodesic
The Lebesgue constant of local cubic splines with equally-spaced knots
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 20 (2017) no. 4, pp. 445-451

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It is proved that the uniform Lebesgue constant (the norm of a linear operator from $C$ to $C$) of local cubic splines with equally-spaced knots, which preserve cubic polynomials, is equal to $11/9$. 
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     author = {V. T. Shevaldin and O. Ya. Shevaldina},
     title = {The {Lebesgue} constant of local cubic splines with equally-spaced knots},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
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V. T. Shevaldin; O. Ya. Shevaldina. The Lebesgue constant of local cubic splines with equally-spaced knots. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 20 (2017) no. 4, pp. 445-451. http://geodesic.mathdoc.fr/item/SJVM_2017_20_4_a7/