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A 90 min Daytime Nap Opportunity Is Better Than 40 min for ..:

Boukhris, Omar ; Trabelsi, Khaled ; Ammar, Achraf...
International Journal of Environmental Research and Public Health.  17 (2020)  13 - p. 4650 , 2020
Link: https://doi.org/10.3390/ijerph17134650