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The automatic indexing system AIR/PHYS and its evaluation by means of a retrieval test with 309 requests and 15,000 documents is described. First, the underlying conception of a rule based approach is given which is suited to the task of a controlled-vocabulary indexing of even large subject fields. Preconditions, performance and results of the retrieval test are described, including first results of retrieval runs with weighted automatic indexing.
Fuhr et al. (Mon,) studied this question.
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