Patrick Opdenbosch Nader Sadegh Wayne J. Book Aaron R. Enes Auto-calibration based control for independent metering of hydraulic actuators. 153-158 2011 ICRA https://doi.org/10.1109/ICRA.2011.5980472 conf/icra/2011 db/conf/icra/icra2011.html#OpdenboschSBE11