Vol. 1-9 (1989-1997); v1(1989)-7(1995); Vol. 10 no. 1 (January 1998) -Vol. 17 no. 12 (December 2005); Vol. 12 no. 11-12 (November-December 2000); Vol. 13-14 (2001-2002); Vol. 14 no. 1 (January 2002) -Vol. 14 no. 12 (December 2002); Vol. 15 no. 1-6 (January-June 2003); Vol. 15 no. 1 (January 2003) -Vol. 15 no. 3 (March 2003); Vol. 18 no. 1/4 (1 January 2006) -Vol. 18 no. 5 (1 March 2006); Vol. 18 no. 9/12 (May 1, 2006) -Vol. 18 no. 21/24 (Dec. 15, 2006); Vol. 19 no. 1/4 (1 January 2007) -Vol. 19 no. 21/24 (15 December 2007); Vol. 20 no. 1/4 (Feb. 15, 2008); Vol. 20 no. 13/16 (July 1-August 15, 2008); Vol. 20 no. 17/20 (Sept.1/Oct.15, 2008); Vol. 20 no. 21/24 (1 November-15 December 2008); Vol. 20 no. 9/12 (May 1-June 15, 2008); Vol. 21 no. 1/4 (1 January-15 February 2009); Vol. 21 no. 17/20 (September 2009) -(October 2009); Vol. 21 no. 21/24 (Nov.-Dec. 2009); Vol. 21 no. 5/8 (March/April 2009); Vol. 21 no. 9/12 (May 2009) -Vol. 21 no. 13/16 (Aug. 2009)

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