Stock Exchange Mergers and Weak Form of Market Efficiency: The Case of Euronext Lisbon
Walayet Khan, João Paulo Vieito
International Review Of Economics And Finance, vol. 22, 2012, p. 173-189.

Is Executive Compensation Different across S&P Listed Firms?
João Paulo Vieito, Walayet Khan, António Cerqueira, Elisio Brandão
Quarterly Journal of Finance and Accounting, vol. 47, 2008, p. 171-192.