A robust nonconforming H2-element. - Trygve K. Nilssen; Xue-Cheng Tai; Ragnar Winther (Math. Comput., 2001)

Level set methods for a parameter identification problem. - Bjørn-Ove Heimsund; Tony F. Chan; Trygve K. Nilssen; Xue-Cheng Tai (Analysis and Optimization of Differential Systems, 2002)

Preconditioned Iterative Methods for Scattered Data Interpolation. - Tom Lyche; Trygve K. Nilssen; Ragnar Winther (Adv. Comput. Math., 2002)

Reuse of standard preconditioners for higher-order time discretizations of parabolic PDEs. - Kent-André Mardal; Trygve K. Nilssen (J. Num. Math., 2006)

Order-Optimal Preconditioners for Implicit Runge-Kutta Schemes Applied to Parabolic PDEs. - Kent-André Mardal; Trygve K. Nilssen; Gunnar Andreas Staff (SIAM J. Sci. Comput., 2007)

Swing options in commodity markets: a multidimensional Lévy diffusion model. - Marcus Eriksson; Jukka Lempa; Trygve Kastberg Nilssen (Math. Methods Oper. Res., 2014)