Submitted on: 25 December 2007.
Revised on: 02 January 2008.
Accepted on: 22 January 2008.
Opuscula Mathematica
Submitted on: 01 August 1998.
Revised on: 07 September 1998.
Accepted on: 28 September 1998.
Opuscula Mathematica---AGH UNIV SCIENCE & TECHNOLOGY PRESS
Submitted on: 17 May 1998.
Revised on: 08 June 1998.
Accepted on: 22 June 1998.
Opuscula Mathematica---AGH UNIV SCIENCE & TECHNOLOGY PRESS
Submitted on: 21 May 2012.
Revised on: 23 June 2012.
Accepted on: 19 July 2012.
Opuscula Mathematica
Submitted on: 31 January 2024.
Revised on: 08 February 2024.
Accepted on: 01 March 2024.
Opuscula Mathematica---AGH UNIV SCIENCE & TECHNOLOGY PRESS
Submitted on: 02 November 2018.
Revised on: 16 December 2018.
Accepted on: 28 December 2018.
Opuscula Mathematica