TYPES OF SUBMISSIONS: CSEI 2021 accepts submissions, from 12 to 15 pages, in English, Q4 in series Lecture Notes in Networks and Systems, journal indexed in Scopus. Papers in this format, accepted to be presented in the conference, will be published in a special number of this journal. Alternatively, papers can be submitted in Springer format, in English and with a minimum of 12 pages. If accepted, these papers will be published as conference proceedings in the book series indexed in Scopus