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Schwinn Hans: On strong approximation of orthogonal series. In: Acta scientiarum mathematicarum, (60) 3-4. pp. 609-618. (1995)
Schwinn Hans: On approximation by Euler means of orthogonal series. In: Acta scientiarum mathematicarum, (49). pp. 283-294. (1985)
Schwinn Hans: On the rate of approximation by orthogonal series. In: Acta scientiarum mathematicarum, (48). pp. 417-430. (1985)
Leindler László; Schwinn Hans: On the strong and extra strong approximation of orthogonal series. In: Acta scientiarum mathematicarum, (45). pp. 293-304. (1983)
Leindler László; Schwinn Hans: Über die absolute Summierbarkeit der Orthogonalreihen. In: Acta scientiarum mathematicarum, (43) 3-4. pp. 311-319. (1981)