Sever.

v.31:1-6 1970; v.31:7-12 1970; v.32:1-6 1971; v.32:7-12 1971; 1972:7-12; v.33:1-6 1972; 1973:1-6; 1973:7-12; 1974:1-6; 1974:7-12; 1975:1-6; 1975:7-12; 1976:1-6; 1976:7-12; 1977:1-6; 1977:7-12; 1978:7-12; 1978:1-6; v.39 1978 JUL-DEC; v.39 1978 JAN-JUN; 1979:1-6; 1979:7-12; v.40 1979 JAN-JUN; 1980:1-6; 1980:7-12; 1981:1-6; 1981:7-12; 1982:7-12; 1982:1-6; 1989 Jul-Dec; 1990 Jan-Apr; 1990 May-Aug; 2002 Jul-Dec; 2002 Jan-Jun; 2003 Jan-Jun; 2004:no.1-4; 2004:no.5/6; 2004:no.7/8; 2004:no.9/10; 2004:no.11/12; 2005:no.1/2; 2005:no.3/4; 2005:no.7/8; 2005:no.9/10; 2005:no.11/12; 2006:no.1/2; 2006:no.3/4; 2006:no.5/6; 2006:no.7/8; 2006:no.9/10; 2006:no.11/12; 2007:no.3/4; 2007:no.5-8; 2007:no.9-12; 2008:no.1-4; 2008:no.5-8