Michi Nishihara Takashi Shibata The agency problem between the owner and the manager in real investment: The bonus-audit relationship. 291-296 2008 36 Oper. Res. Lett. 3 http://dx.doi.org/10.1016/j.orl.2007.09.008 db/journals/orl/orl36.html#NishiharaS08