分面浏览：发表日期 |
| 当前检索式 | ((ALL：COPPER)) |
| 限定条件 | ((专题：北京大学)) |
| 2017 65 | 2016 97 | 2015 74 |
| 2014 92 | 2013 64 | 2012 65 |
| 2011 49 | 2010 38 | 2009 38 |
| 2008 30 | 2007 35 | 2006 35 |
| 2005 52 | 2004 52 | 2003 39 |
| 2002 61 | 2001 40 | 2000 23 |
| 1999 19 | 1998 14 | 1997 9 |
| 1996 14 | 1995 9 | 1994 4 |
| 1993 6 | 1992 3 | 1991 7 |
| 1990 1 | 1989 1 | 1987 2 |
| 1986 1 | 1985 1 | 1984 4 |
| 1982 1 |
