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The validity of Wagner's law in Egypt from 1960–2018:

Noha Hesham Ghazy ; Hebatallah Ghoneim ; Dimitrios Paparas
https://www.emerald.com/insight/content/doi/10.1108/REPS-01-2020-0004/full/pdf?title=the-validity-of-wagners-law-in-egypt-from-1960-2018.  , 2021