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Renewed interest in GeV-scale sterile neutrinos capable of explaining activeneutrino oscillations via see-saw type I mechanism has been expressed inseveral proposals of direct searches. Given this activity we estimate theminimal values of sterile-active mixing angles provided one, two, or threesterile neutrinos are lighter than D-meson.

On the minimal active-sterile neutrino mixing in seesaw type I mechanism with sterile neutrinos at GeV scale