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Lasser Rupert; Obermaier Josef: Weighted shift operators, orthogonal polynomials and chain sequences. In: Acta scientiarum mathematicarum 86. pp. 331-342. (2020)
Lasser Rupert; Obermaier Josef: On the convergence of weighted Fourier expansions with respect to orthogonal polynomials. In: Acta scientiarum mathematicarum, (61) 1-4. pp. 345-355. (1995)
Lasser Rupert: Lacunarity with respect to orthogonal polynomial sequences. In: Acta scientiarum mathematicarum, (47) 3-4. pp. 391-403. (1984)