Perception.

v.1-2 1972-1973; v.3 1974; v.4-5 1975-1976; v.6 1977; v.8 1979; v.10 1981; v.11 1982; v.12 1983; v.13 1984; v.14 1985; v.15 1986; v.16 1987; v.17 1988; v.18 1989; v.19 1990; v.20 1991; v.21 no.1-4 1992; v.21 no.5-6 1992; v.22 no.1-4 1993; v.22 no.5-8 1993; v.22 no.9-12 1993; v.23 no.1-6 1993; v.23 no.7-12 1994; v.23:no.11(1994); v.24 no.1-4 1995; v.24 no.5-8 1995; v.24 no.9-12 1995; v.25no.1-6 1996; v.25 no.1-4 1996; v.25 no.5-8 1996; v.25 no.7-12; v.25 no.9-12 1996; v.26no.1-6 1997; v.26 no.1-4 1997; v.26 no.5-8 1997; v.26 no.7-12; v.26 no.9-12 1997; v.27 no.1-6; v.27 no.1-2 1998; v.27 no.3-4 1998; v.27 no.5-8 1998; v.27 no.7-12; v.27 no.9-12 1998; v.28no.1-6 1999; v.28no.7-12 1999; v.28 no.1-4 1999; v.28 no.5-8 1999; v.28 no.9-12 1999; v.29 no.1-4 2000; v.29 no.5-8 2000; v.29 no.9-12 2000; v.30 no.9-12 2000; v.30 no.1-4 2001; v.30 no.5-8 2001; v.31 no.3-6 2002; v.31 no.7-9 2002; v.31 no.10-12 2002; v.31:no.2(2002); v.32 no.1-4 2003; v.32 no.5-8 2003; v.32 no.9-12 2003; v.33:no.1-4(2004); v.33:no.5-8(2004); v.33:no.9-12(2004); v.34:no.1-4(2005); v.34:no.5-8(2005); v.34:no.9-12(2005); v.35:no.1-4(2006); v.35:no.5-8(2006); v.35:no.10-12(2006); v.36:no.1-3(2007); v.36:no.4-6(2007); v.36:no.7-9(2007); v.36:no.10-12(2007); v.37:no.1-4(2008); v.37:no.5-8(2008); v.37:no.9-12(2008); Suppl.