Konvergenz eines Differenzverfahrens für quasilineare parabolische Anfangs-Randwertprobleme in Zylindersymmetrie. Karl v. Finckenstein, K.-U. v. Hagenow (1972/1973) Numerische Mathematik
Krylov subspace spectral methods for variable-coefficient initial-boundary value problems. Lambers, James V. (2005) ETNA. Electronic Transactions on Numerical Analysis [electronic only]