  "Background-free" spectra of inelastic $\alpha$-particle scattering have been
measured at a beam energy of 385 MeV in $^{90, 92}$Zr and $^{92}$Mo at
extremely forward angles, including 0$^{\circ}$. The ISGMR strength
distributions for the three nuclei coincide with each other, establishing
clearly that nuclear incompressibility is not influenced by nuclear shell
structure near $A\sim$90 as was claimed in recent measurements.
