1. ‘An alternative method of dealing with incontinence in children with neurogenic bladders.’;Caldwell;Archives of Disease in Childhood,1969
2. ‘Electrical treatment of incontinence using an external stimulator with intra-anal electrodes.’;Hopkinson;Annals of the Royal College of Surgeons of England,1972
3. ‘Intravesicular electrotherapy in the spastic bladder caused by myelodysplasia.’;Katona;Zeitschrift für Kinderchirurgie,1973
4. ‘The treatment of the neuropathic bladder by transurethral electrical stimulation.’;Katona;Lancet,1974
5. ‘Über intialuminäre Elektrotherapie von verschiedenen paralytischen Zustanden des gastrointestinalen Trakten mit Quadrangulästrom.’;Katona;Zentralblatt für Chirurgie,1959