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Bala, J.: Quasiparticle bands in the extended t-J model: Application to Nd_2-xCe_xCuO₄. Physical Review B 59, pp. 661 - 667 (1999)

Bala, J.; Oles, A. M.: Quasiparticles in doped CuO₂ and Cu₃O₄ planes. Physica B 261, pp. 449 - 450 (1999)

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Bär, M.; Or-Guil, M.: Alternative Scenarios of Spiral Breakup in a Reaction-Diffusion Model with Excitable and Oscillatory Dynamics. Physical Review Letters 82, pp. 1160 - 1163 (1999)