@article{BezemNieuwenhuisRodriIPL10,
 author = "M. Bezem, R. Nieuwenhuis, E. Rodriguez-Carbonell",
 title = "Hard problems in max-algebra, control theory, hypergraphs and other areas",
 journal = "Information Processing Letters",
 volume = 110,
 number = 4,
 year = 2010,
 pages = "133--138",
}