  Using as a model the Hubbard Hamiltonian we determine various basic
properties of electron-doped cuprate superconductors like
${Nd}_{2-x}{Ce}_{x}{CuO}_{4}$ and ${Pr}_{2-x}{Ce}_{x}{CuO}_{4}$ for a
spin-fluctuation-induced pairing mechanism. Most importantly we find a narrow
range of superconductivity and like for hole-doped cuprates $d_{x^{2}-y^{2}}$ -
symmetry for the superconducting order parameter. The superconducting
transition temperatures $T_{c}(x)$ for various electron doping concentrations
$x$ are calculated to be much smaller than for hole-doped cuprates due to the
different Fermi surface and a flat band well below the Fermi level. Lattice
disorder may sensitively distort the symmetry $d_{x^{2}-y^{2}}$ via
electron-phonon interaction.
