Wahyudi, S. B.; Sensuse, D. I.; Lusa, S.; Qurani, M. H.; Yasin, Y.; Mailinda, I. Absent or Unretrievable: A Two-Layer Knowledge Management Framework for Retrieval-Critical Product Knowledge in a Grocery E-Commerce AI Shopping Assistant. CJ 2026, 4 (2), 320-327. https://doi.org/10.58477/cj.v4i2.510.