Krein spaces numerical ranges and their computer generation. Bebiano, Natalia, da Providência, Joao, Nata, Ana Cristina, Pereira Soares, Maria da Graca (2008) ELA. The Electronic Journal of Linear Algebra [electronic only]
Krylov subspace acceleration for nonlinear multigrid schemes. Washio, T., Oosterlee, C.W. (1997) ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Krylov subspace spectral methods for variable-coefficient initial-boundary value problems. Lambers, James V. (2005) ETNA. Electronic Transactions on Numerical Analysis [electronic only]
k-Step Iterative Methods for Solving Nonlinear Systems of Equations. W. Niethammer, M.H. Gutknecht (1986) Numerische Mathematik
Kubaturformeln mit minimaler Knotenzahl. -Minimum-Point Cubature Formulas. H.M. Möller (1975/1976) Numerische Mathematik