Valentina Emilia Balas, Lakhmi C. Jain, Marius Mircea Balas, Dumitru Baleanu: Soft Computing Applications - Proceedings of the 9th International Workshop Soft Computing Applications (SOFA 2020), Arad, Romania, 27-29 November 2020. Advances in Intelligent Systems and Computing 1438, Springer 2023, ISBN 978-3-031-23635-8