1. Bondurant, C. P.: Alteration of suction tip pressure. J. Neurosurg. 46 (1977) 559
2. Vällfors, B.: A new surgical sucker end. Acta Chir. Scand. 137 (1971) 700–701
3. Vällfors, B.: Neurosurgical suction systems. An experimental study. Thesis. University of Göteborg, Göteborg, Sweden, 1976
4. Vällfors, B., H.-A. Hansson: Modified suction system for neurosurgery. Surg. Neurol. 13 (1979) 397–399
5. Vällfors, B., Hansson, H.-A. Johansson, et al.: Studies on optimal conditions in surgical suction systems. Acta Chir. Scand. Suppl. 474, 1976