Unknown disturbance estimation for vibration systems using distributed piezoelectric sensorsBin-Yi Wu, Xian-Sheng Qin, Shun-Qi Zhang, Jing Bai, Ting Xue and Rüdiger SchmidtMechanics & Industry, 19 5 (2018) 506DOI: https://doi.org/10.1051/meca/2018042