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Date issued
- 4357 1990 - 1999
- 2043 1980 - 1989
- 149 1970 - 1979
- 34 1960 - 1969
- 90 1950 - 1959
- 115 1940 - 1949
- 40 1930 - 1939
- 141 1920 - 1929
- 80 1910 - 1919
- 103 1900 - 1909
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Document type
- 4691 Article
- 514 Book
- 397 Doctoral thesis
- 394 Contribution to periodical
- 335 Conference object
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