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