Author

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J. A. Burggraaff
21 articles by this author
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Article
 01-05-1981
 Unique: 396 | Total: 746  | Access Period:
 246-246
Article
 01-12-1980
 Unique: 396 | Total: 741  | Access Period:
 544-545
Article
 01-03-1980
 Unique: 486 | Total: 1317  | Access Period:
 102-105
Article
 01-12-1979
 Unique: 446 | Total: 837  | Access Period:
 554-562
Article
 01-04-1978
 Unique: 387 | Total: 703  | Access Period:
 162-168
Article
 01-06-1977
 Unique: 419 | Total: 739  | Access Period:
 274-281
Article
 01-03-1977
 Unique: 405 | Total: 742  | Access Period:
 98-103
Article
 01-02-1976
 Unique: 399 | Total: 706  | Access Period:
 104-116
Article
 01-01-1976
 Unique: 397 | Total: 745  | Access Period:
 55-57
Article
 01-01-1976
 Unique: 510 | Total: 936  | Access Period:
 5-12
Article
 01-11-1975
 Unique: 399 | Total: 750  | Access Period:
 446-448

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