Gulec, H., E. Ozayar, A. Alkan, M. Kacan, M. Babayigit, A. Kurtay, I. Demirkale, and E. Horasanli. “Comparison of Two Low Dose Local Anesthetics in Combination With Morphine for Spinal Anesthesia for Total Knee Arthroplasty”. Anaesthesia, Pain & Intensive Care, Vol. 24, no. 4, Sept. 2020, pp. 397-02, doi:10.35975/apic.v24i4.1311.