Subcortical Laminar Heterotopia in Two Sisters and Their Mother: MRI, Clinical Findings and Pathogenesis - van der Valk, P H M; Snoeck, I; Meiners, L C; des Portes, V; Chelly, J; Pinard, J -M; Ippel, P F; van Nieuwenhuizen, O; Peters, A C B (Neuropediatrics, 1999)