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Walberg's (1981) nine-factor productivity model was tested with a national probability sample of 3,116 adolescents. A three-wave longitudinal design incorporated data from students, teachers, and parents to construct a latent-variable model of science achievement
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Stored only when both papers are in the corpus — 135 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.