@article{10.30755/NSJOM.ns45.1.pre,
     author = { },
     title = {PREFACE},
     journal = {Novi Sad Journal of Mathematics},
     pages = {1 - 3},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2015},
     doi = {10.30755/NSJOM.ns45.1.pre},
     url = {http://geodesic.mathdoc.fr/articles/10.30755/NSJOM.ns45.1.pre/}
}