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Stability and analyticity in maximum-norm for simplicial Lagrange finite element semidiscretizations of parabolic equations with Dirichlet boundary conditions. Numerische Mathematik 87(2): 373-389 (2000) - Shao-Liang Zhang, Yoshio Oyanagi, Masaaki Sugihara:
Necessary and sufficient conditions for the convergence of Orthomin(k) on singular and inconsistent linear systems. Numerische Mathematik 87(2): 391-405 (2000)