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- NORDSCI 2019. International Conference on Social Sciences. NORDSCI 2019: International Conference on Social Sciences : Proceedings of the International Scientific Conference, 19-23 August 2019, NOVOTEL, (Athens, Greece). Book 2/ Vol. 2,. 1st Edition. Sofia : Saima Consult, 2019. [475 s.]. Available on Internet: <www.nordsci.org> ISBN 978-619-7495-06-5. ISSN 2603-4107.
book
- NORDSCI 2018. Conference. NORDSCI 2018 : Nordsci Conference Proceedings on Social Sciences, 17-19 July 2018, Helsinki, Finland. Book 1. Volume 1. Sofia : Saima Consult, 2018. [520] p. ISBN 978-619-7495-00-3. ISSN 2603-4107.
electonic book