On one-parameter families of diffeomorphisms Pavol Brunovský (1970) Commentationes Mathematicae Universitatis Carolinae Similarity:
On the method of least squares of finding eigenvalues and eigenfunctions of some symmetric operators. II. Karel Najzar (1970) Commentationes Mathematicae Universitatis Carolinae Similarity:
Error-estimates for the Ritz's method of finding eigenvalues and eigenfunctions Karel Najzar (1971) Commentationes Mathematicae Universitatis Carolinae Similarity: