Jérôme Fortin Adam Kasperski Pawel Zielinski Some methods for evaluating the optimality of elements in matroids with ill-known weights. 1341-1354 2009 160 Fuzzy Sets and Systems 10 http://dx.doi.org/10.1016/j.fss.2008.11.013 db/journals/fss/fss160.html#FortinKZ09