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  1. The Effect of COVID-19 on Loneliness in the Elderly. An Empirical Comparison of Pre-and Peri-Pandemic Loneliness in Community-Dwelling Elderly.Theresa Heidinger & Lukas Richter - 2020 - Frontiers in Psychology 11.
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  • Items 271 -547.[author unknown] - 1936 - Journal of Symbolic Logic 1 (4):183-216.
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