A method of BAZLEY-FOX type for the eingenvalues of the LAPLACE operator W. Weinelt — 1974 Acta Universitatis Carolinae. Mathematica et Physica
On the Convergence of Difference Schemes for the Approximation of Solutions u...W... (m>0.5) of Elliptic Equations with Mixed Derivatives. R.D. Lazarov; V. Makarov; W. Weinelt — 1984 Numerische Mathematik