• Kernels of digraphs with finitely many ends 

      Walicki, Michal (Journal article; Peer reviewed, 2019)
      According to Richardson’s theorem, every digraph without directed odd cycles that is either (a) locally finite or (b) rayless has a kernel (an independent subset with an incoming edge from every vertex in ). We generalize ...
    • Transversals of longest paths 

      Cerioli, Marcia R.; Fernandes, Cristina G.; Gómez, Renzo; Gutiérrez, Juan; Lima, Paloma T. (Journal article; Peer reviewed, 2020-03)
      Let lpt(G) be the minimum cardinality of a transversal of longest paths in G, that is, a set of vertices that intersects all longest paths in a graph G. There are several results in the literature bounding the value of ...