1979: Vol. 13B, No. 1-2 1980: Vol. 14B, No. 1-2 1981: Vol. 15B, No. 1-6 1982: Vol. 16B, No. 1 1989: Vol. 23B, No. 1 1990: Vol. 24B, No. 1-6 1991: Vol. 25B, No. 1-6 1992: Vol. 26B, No. 1-6 1993: Vol. 27B, No. 1-5 1994: Vol. 28B, No. 1-6 1995: Vol. 29B, No. 1-6 1996: Vol. 30B, No. 1-6 1997: Vol. 31B, No. 1-6 1998: Vol. 32B, No. 1-8 1999: Vol. 33B, No. 1-3 2002: Vol. 36B, No. 1-2, 4-10 2003: Vol. 37B, No. 2-10 2004: Vol. 38B, No. 1-10 2005: Vol. 39B, No. 1-10 2006: Vol. 40B, No. 1-10 2007: Vol. 41B, No. 1, 2