O gafesɛbɛna nunu fɛ inafo Walzer (1992), Alessandrini (2002), Newtown, Stolle & Rochon, Foley & Edwards (1997), ani Walters, jamana kɔnɔ denw, walima tas, baraada sabanan, minna adamadenw bɛ sɛ ka jɛɲɔgɔnya siraw sigisɛnkan ani ka u sɔminɛ.