Walt Jung did a two part article on power supplies in the April and May 2007 issues of AudioXpress magazine. The articles cover much more than current sources.
Sources 101: Audio Current Regulator Tests for High Performance.
Part 2: Precise High Current/Voltage Operation
http://www.audioxpress.com/magsdirx/ax/addenda/media/jung2778.pdf
http://www.audioxpress.com/magsdirx/ax/addenda/media/jung2779.pdf
Sources 101: Audio Current Regulator Tests for High Performance.
Part 2: Precise High Current/Voltage Operation
http://www.audioxpress.com/magsdirx/ax/addenda/media/jung2778.pdf
http://www.audioxpress.com/magsdirx/ax/addenda/media/jung2779.pdf