THE REGISTRATION WILL BE INCOMPLETE UNTIL THE PAYMENT OF THE CONFERENCE FEE IS RECEIVED.
Please see: https://indico.ict.inaf.it/event/3000/page/1434-conference-fee
If you need an invitation letter, please email the LOC (swift20_loc@googlegroups.com) with your personal data, your institution name and address, and the expected dates of arrival and departure.