Nacheva, R., Sulova, S. (2021) Research on the Overall Attitude Towards Mobile Learning in Social Media: Emotions Mining Approach, Cham: Springer Intern. Publ. Switzerland pp. 429 - 440. - (Studies in Big Data ; Book 84), ISBN 978-3-030-65724-6 (print) ; 978-3-030-65722-2.