Sousa R, Cruzeiro AB, Guerra M. Barrier option pricing under the 2-hypergeometric stochastic volatility model. Journal of Computational and Applied Mathematics. 2018;328:197-213.Edit

Sousa R, Yakubovich S. The spectral expansion approach to index transforms and connections with the theory of diffusion processes. Communications on Pure & Applied Analysis. 2018;17(6):2351-2378.Edit