. (2003). . (e123931). Strategy, 11(2), e123931
. "" .e123931 , Strategy, 11, 2, 2003, e123931.
. (2003). '', Strategy, 11(2), e123931.
, "," Strategy, 11 2 (2003): e123931,
. . Strategy. 2003;11(2):e123931 (In Persian).
