Advances in Condition Monitoring of Machinery in Non-Stationary Operations Proceedings of the 6th International Conference on Condition Monitoring of Machinery in Non-Stationary Operations, CMMNO'2018, 20-22 June 2018, Santander, Spain - Fernandez Del Rincon, Alfonso; Viadero Rueda, Fernando; Chaari, Fakher; Zimroz, Radoslaw; Haddar, Mohamed (Springer International Publishing : Imprint: Springer, 2019)