M. Sihombing, H. Gultom, P. M. Tanjung, S. E. T. Ambarita, D. Rahanum, and Basri, “Analysis of perioperative care using the finger hold technique to reduce postoperative pain in laparotomy patients”, JPNP, vol. 1, no. 1, pp. 24–31, Jun. 2026.