@article{AMC_2011__4_2_a0,
     author = {Roman Nedela and Martin \v{S}koviera},
     title = {
		{GEMS} 2009
	},
     journal = {Ars Mathematica Contemporanea},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMC_2011__4_2_a0/}
}