@article{DMGT_2011_31_3_a10,
     author = {Mih\'ok, Peter and Semani\v{s}in, Gabriel},
     title = {Unique factorization theorem for object-systems},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {559--575},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2011_31_3_a10/}
}