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2020
Yip, Paul, Chen, Mengni, So, Bing Kwan 
ORCID: 0000-0003-2422-305X, Lam, Kwok Fai and Wat, Kam Pui
(2020).
Optimal Strategies for Reducing Number of People in the Social Security System.
International Journal of Environmental Research and Public Health, 17 (4).
p. 1305.
Basel:
MDPI AG.
ISSN 1660-4601