Invitation letters for visa purposes will be issued only to conference attendees who have papers authored and have completed the registration to the conference (with payment). Please, send your request and the following information to Percom 2019 Registration Desk (

  • Full name as in your passport
  • Complete affiliation
  • Passport number
  • Date of issue
  • Date of expiration
  • Issued by (i.e. Your nationality)
  • Date of birth
  • Title and number of your paper (in case of authors)
  • Proof of registration