The effect of heart rate on wave reflections may be determined by the level of aortic stiffness: Clinical and technical implications - Papaioannou, T.G.; Vlachopoulos, C.V.; Alexopoulos, N.A.; Dima, I.; Pietri, P.G.; Protogerou, A.D.; Vyssoulis, G.G.; Stefanadis, C.I. (American Journal of Hypertension, 2008)