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The attention given to fertility levels, trends and differentials in recent years has resulted in an increase both in empirical research, designed to establish facts and relationships, and in theory development, which has sought to synthesise this rapidly expanding body of knowledge. Conceptual models of a social, psychological, and economic nature have been advanced (see as examples Freedman, 1967; Fawcett, 1970; T. W. Schultz, 1973). These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Stored only when both papers are in the corpus — 19 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
Imported from OpenAlex (CC0) — nothing here is generated.