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A simple unifying mass matrix is presented for the three active and onesterile neutrinos $\nu_e$, $\nu_\mu$, $\nu_\tau$ and $\nu_s$, using anextension of the radiative mechanism proposed some time ago by Zee. The totalneutrino-oscillation data are explained by the scheme $\nu_e \leftrightarrow\nu_s$ (solar), $\nu_\mu \leftrightarrow \nu_\tau$ (atmospheric) and $\nu_e\leftrightarrow \nu_\mu$ (LSND). We obtain the interesting approximaterelationship $(\Delta m^2)_{atm} \simeq 2[(\Delta m^2)_{solar} (\Deltam^2)_{LSND}]^{1/2}$ which is well satisfied by the data.Comment: Latex, 12 pages including two figures

Radiative neutrino mass matrix for three active plus one sterile species