@article{10_14708_cm_v51i2_5318,
     author = {Marcin Krzywkowski},
     title = {The hat problem on a union of disjoint graphs},
     journal = {Commentationes Mathematicae},
     pages = { 167--176},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2011},
     doi = {10.14708/cm.v51i2.5318},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v51i2.5318/}
}