PayPal or Credit Card – Registration Please, select an option. Early fee until 30 April 2024 SIS member 150,00 € EURSIS member junior/retired 110,00 € EURNon-SIS member senior (over 35) 180,00 € EURNon-SIS member junior (under 35) 150,00 € EURForeign scholars 180,00 € EUR