On the evaluation of layer potentials close to their sources. - Johan Helsing; Rikard Ojala (J. Comput. Phys., 2008)

Corner singularities for elliptic problems: Integral equations, graded meshes, quadrature, and compressed inverse preconditioning. - Johan Helsing; Rikard Ojala (J. Comput. Phys., 2008)

An accurate integral equation method for simulating multi-phase Stokes flow. - Rikard Ojala; Anna-Karin Tornberg (J. Comput. Phys., 2015)