Forbes Billionaires 2011: Mittal, Mukesh Ambani in top 10

London-based Indian steel magnate Lakshmi Narayan Mittal has featured as the sixth richest person in the latest edition of Forbes list of World's Billionaires. Another world renowned Indian industrialist Mukesh Ambani, who heads the empire of Reliance Industries, ranked in the ninth position, closely following Mittal.