Quasiconvex Subgroups of F_m x Z^n are Convex
  In this paper we analyze the action of a quasiconvex subgroup of F_m x Z^n on the convex hull of its orbit and we show that this action is cocompact. Further, using our techniques, we obtain complete description of the quasiconvex subgroups of F_m x Z^n. 
Jordan Sahattchieve
math.GR