@article{COMA_2010__50_2_291567,
     author = {Marcin Krzywkowski},
     title = {A modified hat problem},
     journal = {Commentationes Mathematicae},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {2010},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/COMA_2010__50_2_291567/}
}