Pedersen, N. H., P. Johansen, L. Schmidt, R. Scheidl, and T. O. Andersen. “Control and Performance Analysis of a Digital Direct Hydraulic Cylinder Drive”. International Journal of Fluid Power, vol. 20, no. 3, Mar. 2020, pp. 295-22, doi:10.13052/ijfp1439-9776.2032.