Occlusion of the pig superior sagittal sinus, bridging and cortical veins: multistep evolution of sinus-vein thrombosis. - Fries,G.; Wallenfang,T.; Hennen,J.; Velthaus,M.; Heimann,A.; Schild,H.; Perneczky,A.; Kempski,O. (J Neurosurg, 1992)