1. Stepping up the fight against undeclared work;European Commission,2007
2. Small business in the informal economy: making the transition to the formal economy;Small Business Council,2004
3. Note on the frequency of use of the different digits in natural numbers;Newcomb;Amer. J. Math.,1881
4. The law of anomalous numbers;Benford;Proc. Am. Phil. Soc.,1938
5. Benford’s Law: Applications for Forensic Accounting, Auditing, and Fraud Detection;Nignini,2012