• Each accepted paper must be supported by a «Regular Fee» (*) paid by one of the authors.
• Each «regular fee» paid by a registered author cannot be applied to more than a paper, unless listed as sole author of all of them.
• The registration procedure will request the code number of the paper (if any) supported by the fee. 
• An author registered with a regular fee can support additional papers using the fee “Extra paper” for each additional paper. 
• Undergraduate students have to accredit their condition; the student fee is not allowed for PhD students.
• The «Under 35s» and /or ADINGOR Joven» fee is available for those aged 35 or less the first day of the Conference (6th July, 2023) and/or registered members of ADINGOR Joven on the date of the registration. Please mail to cio2023.oe@upc.edu scanned proof of either birthdate or membership. 

(*) Regular Fee is a Normal fee, ADINGOR members fee, Undergraduate Students or Master Students fee or Under 35s fee.