@article{NCD_2013_22_a0,
     author = {Zoran Krstulovi\'c},
     title = {Preface},
     journal = {Review of the National Center for Digitization},
     publisher = {mathdoc},
     volume = {22},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/NCD_2013_22_a0/}
}