Calibration of a basket option model applied to company valuation. - Stefan Wörner; Borjana Racheva-Iotova; Stoyan V. Stoyanov (Math. Methods Oper. Res., 2002)

Stochastic models for risk estimation in volatile markets: a survey. - Stoyan V. Stoyanov; Borjana Racheva-Iotova; Svetlozar T. Rachev; Frank J. Fabozzi (Ann. Oper. Res., 2010)