1. An introduction to copulas" Springer Lecture Notes in Statistics;R B Nelsen;Multivariate option pricing with copulas,1998
2. Pricing CMS spread options and digital CMS spread options with smile" Wilmott magazine;M N Bennett;abstract=412441, 2003. M. Berrahoui,2004
3. Local Time for the SABR Model: Connection with the 'Complex' Black Scholes and Application to CMS and Spread Options