A Cappiello
Rivista Italiana di Economia Demografia e Statistica 68 (1), 79-86 2014
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LEHMANN E.L. 2006. Non parametrics: statistical methods based on ranks (POD). Originally published by Prentice-Hall 1st ed. 1975. Springer, XVI, 464p.
WORLD BANK 2014. Doing Business, Starting a Business. Washington D.C