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Submitted on: 03 July 2019.
Revised on: 13 October 2019.
Accepted on: 27 October 2019.
___________________Global Social Welfare---SPRINGER INT PUBL AG
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Submitted on: 27 December 2012.
Revised on: 16 February 2013.
Accepted on: 12 April 2013.
___________________Global Social Welfare---SPRINGER INT PUBL AG
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Submitted on: 09 July 2000.
Revised on: 01 October 2000.
Accepted on: 01 November 2000.
___________________Global Social Welfare---SPRINGER INT PUBL AG
Submitted on: 26 October 2002.
Revised on: 15 December 2002.
Accepted on: 25 December 2002.
___________________Global Social Welfare---SPRINGER INT PUBL AG
Submitted on: 11 April 2003.
Revised on: 21 May 2003.
Accepted on: 08 June 2003.
___________________Global Social Welfare---SPRINGER INT PUBL AG