@article{10_1007_s10492_004_6401_2,
     author = {Mach, Jan},
     title = {Finite element analysis of free material optimization problem},
     journal = {Applications of Mathematics},
     pages = {285--307},
     publisher = {mathdoc},
     volume = {49},
     number = {4},
     year = {2004},
     doi = {10.1007/s10492-004-6401-2},
     mrnumber = {2076487},
     zbl = {1099.65112},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-004-6401-2/}
}