Q. K. Bùi, M. T. Lê, Đức T. Bùi, T. H. Nguyễn, and H. T. Nguyễn, “THE PREVALENCE OF POSTOPERATIVE COGNITIVE DYSFUNTION IN THE ELDERLY AFTER SPINAL ANESTHESIA FOR HIP AND KNEE JOINT ARTHROPLASTY”, VMJ, vol. 538, no. 1, May 2024.