Submitted on: 14 December 2007.
Revised on: 19 January 2008.
Accepted on: 24 January 2008.
Miskolc Mathematical Notes---UNIV MISKOLC INST MATH
Submitted on: 08 December 2023.
Revised on: 13 January 2024.
Accepted on: 23 January 2024.
Miskolc Mathematical Notes---UNIV MISKOLC INST MATH
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Submitted on: 04 October 2023.
Revised on: 24 October 2023.
Accepted on: 16 November 2023.
Miskolc Mathematical Notes---UNIV MISKOLC INST MATH
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Submitted on: 29 September 2005.
Revised on: 18 October 2005.
Accepted on: 04 November 2005.
Miskolc Mathematical Notes---UNIV MISKOLC INST MATH
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