The cleaning up of waste present in transboundary rivers, which re- quires the cooperation of dierent authorities, is a problematic issue, espe- cially when responsibility for the discharge of the waste is not well-dened. Following Ni and Wang [12] we assume that a river is a segment divided...

The aim of this paper is to propose a new solution for the roommate problem with strict preferences. We introduce the solution of maximum irreversibility and consider almost stable matchings (Abraham et al. [2]) and maximum stable matchings (Tan [30] [32]). We nd that almost stable matchings are...