1 m Rq 1 1 Rr 3 RSm, PSm, WSm = Xsi 1 L d 2 Rsk = Z (x) dx m i=1 Pq = Z (x) dx Rq3 Rr 0 Wq L 0 dx Xs1 Xs2 Xs3 Xsi Xsm dZ (x) / dx Rsk > 0