The tree of irreducible numerical semigroups with fixed Frobenius number
  In this paper we present a procedure to build the set of irreducible numerical semigroups with a fixed Frobenius number. The construction gives us a rooted tree structure for this set. Furthermore, by using the notion of Kunz-coordinates vector we translate the problem of finding such a tree into the problem of manipulating 0-1 vectors with as many component as the Frobenius number. 
V. Blanco and J.C. Rosales
math.NT math.AC math.CO