https://www.opindia.com/2019/02/budget-2019-demonetization-helped-undisclosed-income-to-light-and-over-3-lakh-shell-companies-deregistered-says-piyush-goyal/
Budget 2019: Demonetization helped undisclosed income to light and over 3 lakh shell companies deregistered, says Piyush Goyal