Submitted on: 18 January 2016.
Revised on: 16 March 2016.
Accepted on: 06 May 2016.
___________________Collectanea Mathematica---SPRINGER-VERLAG ITALIA SRL
http://reply.papertrans.cn/1/59/5879/5879-22.png
http://reply.papertrans.cn/1/59/5879/5879-23.png
http://reply.papertrans.cn/1/59/5879/5879-24.png
Submitted on: 29 April 2022.
Revised on: 15 June 2022.
Accepted on: 16 July 2022.
___________________Collectanea Mathematica---SPRINGER-VERLAG ITALIA SRL
Submitted on: 14 September 2004.
Revised on: 02 December 2004.
Accepted on: 24 January 2005.
___________________Collectanea Mathematica---SPRINGER-VERLAG ITALIA SRL
Submitted on: 14 January 2009.
Revised on: 07 May 2009.
Accepted on: 22 June 2009.
___________________Collectanea Mathematica---SPRINGER-VERLAG ITALIA SRL
Submitted on: 28 November 2012.
Revised on: 18 March 2013.
Accepted on: 02 April 2013.
___________________Collectanea Mathematica---SPRINGER-VERLAG ITALIA SRL
http://reply.papertrans.cn/1/59/5879/5879-29.png
http://reply.papertrans.cn/1/59/5879/5879-30.png