An improved estimation to make Markowitz's portfolio optimization theory users friendly and estimation accurate with application on the US stock market investment. - Pui Lam Leung; Hon-Yip Ng; Wing-Keung Wong (Eur. J. Oper. Res., 2012)

Currency option pricing with Wishart process. - Kwai Sun Leung; Hoi Ying Wong; Hon-Yip Ng (J. Comput. Appl. Math., 2013)