M. Peysokhan, S. Sabiza, A. Ronagh, and M. Razi Jalali, “Postoperative pain assessment with concurrent administration of intraperitoneal tramadol and incisional lidocaine following ovariohysterectomy in dogs”, J Hellenic Vet Med Soc, vol. 73, no. 1, pp. 3597–3604, Apr. 2022.