Xue, J., Y. Zhang, Z. Song, L. Wang, and B. Bo. “Effect of Family Nutrition Therapy on Elderly Patients With Chronic Obstructive Pulmonary Disease”. Journal of Geriatric Medicine, vol. 2, no. 1, Sept. 2020, pp. 11-15, doi:10.30564/jgm.v2i1.2242.