Natzkova, J., and V. Stoyanova. “Assessment of the Subjectively Perceived Cognitive Deficit in Hospitalized Elderly Patients With Depression and the Relationship of Perceived Deficit Questionnaire – PDQ-D5 With the Socio-Demographic and Clinical Factors”. Proceedings of the Bulgarian Academy of Sciences, vol. 76, no. 2, Feb. 2023, pp. 292-01, doi:10.7546/CRABS.2023.02.14.