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By combining a generalized Lanczos scheme with the variational Monte Carlomethod we can optimize the short- and long-range properties of the groundstateseparately. This allows us to measure the long-range order of the groundstateof the $t$-$J$ model as a function of the coupling constant $J/t$, and identifya region of finite d-wave superconducting long-range order. With a lattice sizeof 50 sites we can reliably examine hole densities down to 0.16.Comment: 12 pages and 4 PostScript figures, ReVTeX 3.0, ETH-TH/94-1

Superconductivity in the Two-Dimensionald t-J Model at Low Hole Doping