@article{10_1007_s10492_005_0020_4,
     author = {Pultarov\'a, Ivana},
     title = {The strengthened {C.B.S.} inequality constant for second order elliptic partial differential operator and for hierarchical bilinear finite element functions},
     journal = {Applications of Mathematics},
     pages = {323--329},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {2005},
     doi = {10.1007/s10492-005-0020-4},
     mrnumber = {2133733},
     zbl = {1099.65102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-005-0020-4/}
}