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Number of items: **5**.

Schwinn, Hans:
*On strong approximation of orthogonal series.*
Acta scientiarum mathematicarum, (60) 3-4.
pp. 609-618.(1995)

Schwinn, Hans:
*On approximation by Euler means of orthogonal series.*
Acta scientiarum mathematicarum, (49).
pp. 283-294.(1985)

Schwinn, Hans:
*On the rate of approximation by orthogonal series.*
Acta scientiarum mathematicarum, (48).
pp. 417-430.(1985)

Leindler, László and Schwinn, Hans:
*On the strong and extra strong approximation of orthogonal series.*
Acta scientiarum mathematicarum, (45).
pp. 293-304.(1983)

Leindler, László and Schwinn, Hans:
*Über die absolute Summierbarkeit der Orthogonalreihen.*
Acta scientiarum mathematicarum, (43) 3-4.
pp. 311-319.(1981)