A Parallel Fictitious Domain Method for the Three-Dimensional Helmholtz Equation. - Erkki Heikkola; Tuomo Rossi; Jari Toivanen (PP, 1999)

On Computation of Scattering Matrices and on Surface Waves for Diffraction Gratings. - Valery E. Grikurov; Erkki Heikkola; Pekka Neittaanmäki; Boris A. Plamenevskii (Numerische Mathematik, 2003)

Robust Formulations for Training Multilayer Perceptrons. - Tommi Kärkkäinen; Erkki Heikkola (Neural Comput., 2004)

An algebraic multigrid based shifted-Laplacian preconditioner for the Helmholtz equation. - Tuomas Airaksinen; Erkki Heikkola; Anssi Pennanen; Jari Toivanen (J. Comput. Phys., 2007)

Controllability method for the Helmholtz equation with higher-order discretizations. - Erkki Heikkola; Sanna Mönkölä; Anssi Pennanen; Tuomo Rossi (J. Comput. Phys., 2007)

Time-harmonic elasticity with controllability and higher-order discretization methods. - Sanna Mönkölä; Erkki Heikkola; Anssi Pennanen; Tuomo Rossi (J. Comput. Phys., 2008)

A Parallel Domain Decomposition Method for the Helmholtz Equation in Layered Media. - Erkki Heikkola; Kazufumi Ito; Jari Toivanen (SIAM J. Sci. Comput., 2019)