@article{10_21136_AM_1991_104459,
     author = {Kobza, Ji\v{r}{\'\i} and Z\'apalka, Du\v{s}an},
     title = {Natural and smoothing quadratic spline. {(An} elementary approach)},
     journal = {Applications of Mathematics},
     pages = {187--204},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1991},
     doi = {10.21136/AM.1991.104459},
     mrnumber = {1109124},
     zbl = {0731.65006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1991.104459/}
}