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| In this page,you can find out the archived papers , please select the conditons! |
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| The following issues were printed from 1977 to 2001. Since 2002 six issues have been printed per year. |
| Year (Volume) |
the number of issues |
| 1977 (Vol. 1) | 2 |
| 1978 (Vol. 2) | 2 |
| 1979 (Vol. 3) | 4 |
| 1980 (Vol. 4) | 2 |
| 1981 (Vol. 5) | 1 |
| 1982 (Vol. 6) | 2 |
| 1983 (Vol. 7) | 2 |
| 1984 (Vol. 8) | 2 |
| 1985 (Vol. 9) | 2 |
| 1986 (Vol. 10) | 2 |
| 1987 (Vol. 11) | 2 |
| 1988 (Vol. 12) | 2 |
| 1989 (Vol. 13) | 2 |
| 1990 (Vol. 14) | 2 |
| 1991 (Vol. 15) | 2 |
| 1992 (Vol. 16) | 2 |
| 1993 (Vol. 17) | 3 |
| 1994 (Vol. 18) | 3 |
| 1995 (Vol. 19) | 3 |
| 1996 (Vol. 20) | 4 |
| 1997 (Vol. 21) | 4 |
| 1998 (Vol. 22) | 4 |
| 1999 (Vol. 23) | 4 |
| 2000 (Vol. 24) | 4 |
| 2001 (Vol. 25) | 4 |
| 2002 - Present | 6 per year |
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