Gulec, H.; Ozayar, E.; Alkan, A.; Kacan, M.; Babayigit, M.; Kurtay, A.; Demirkale, I.; Horasanli, E. Comparison of Two Low Dose Local Anesthetics in Combination With Morphine for Spinal Anesthesia for Total Knee Arthroplasty. apic 2020, 24, 397-402.