Kalesnik, Y. Development of BELL online courses: problems and solutions / Y. Kalesnik // Enhancement of lifelong learning in Belarus : proceedings of the final conference on the Erasmus+ project, Brest, October 13–14, 2020 / Ministry of Education of the Republic of Belarus, Educational Establishment “Brest State Technical University” ; editorial board : K. Laganovska, V. A. Khaletsky, I. A. Pozdnyakova. – Brest : BrSTU, 2020. – P. 51–55.