Based on data collected with secondary school students within the Illumine project, researchers from University of Belgrade (Serbia) prepared a paper titled “Student Engagement in Online and Face-to-Face Classes in Times of Pandemic” and published it in a national Serbian journal “Studies in Teaching and Education”.
The full text can be accessed at the Journal’s website, under the “latest Journal issues”: https://www.pedagog.rs/studies-in-teaching-and-education/