MONDAL, Nitesh, and Biswanath DATTA. “Performance Evaluation and Frequency Response Analysis of a Two Stage Two Spool Electrohydraulic Servovalve With a Linearized Model”. Engineering Transactions, vol. 67, no. 3, May 2019, pp. 411–427, https://doi.org/10.24423/EngTrans.945.20190509.