4 See Barzelay (1992); Halligan, Macintosh and Watson (1996); Hennessey (1986); Hood and Peters (1994); Pollitt et al.
4 Voir à ce sujet, Barzelay (1992); Halligan, Macintosh et Watson (1996); Hennessey (1986); Hood et Peters (1994); Pollitt et al.