@article{10_1007_s10492_008_0041_x,
     author = {Dal{\'\i}k, Josef},
     title = {Optimal-order quadratic interpolation in vertices of unstructured triangulations},
     journal = {Applications of Mathematics},
     pages = {547--560},
     publisher = {mathdoc},
     volume = {53},
     number = {6},
     year = {2008},
     doi = {10.1007/s10492-008-0041-x},
     mrnumber = {2469065},
     zbl = {1199.41006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-008-0041-x/}
}