General technical report NE.

no.50-56 1979-80; no.72-75; no.76-80; no.82 1983; no.83-90 1983-84; no.97-100 1985; no.101-108 1985-86; no.109-111 1986; no.112-116; no.124 1989; no.129 1990; no.145 1990; 148 (1991); no.148-151 1991; no.149-150 1991; no.96 1992; no.159 1992; no.168-169 1993; no.171-175 1993; no.176-182 1993-1994; no.183 1994; no.184-185 1994; no.187-193 1994; no.196-197 1995; no.198-200 1995; no.203-210 1995; no.211-217 1995-1996; 223 (1996); no.218-221 1996; no.222-231 1996-1997; no.232-236 1997; no.237-240 1997; no.241-245 1997-1998; no.244-246 1998; no.246-248 1998; no.249 1998; no.250-254 1998; no.255 1999; no.256-263 1999; no.265-267 1999-2000; no.267-268 2000; no.270-272 2000; no.277-281 2001; no.296 2002; no.303 2003; no.340 2006; 203; 211