1. 1) Finzel D., Jang D. and Helduser U., Electro-hydraulic Dual-circuit System to Improve the Energy Efficiency of Mobile Machines, 7th International Fluid Power Conference , Vol. 3, p. 151-163 (2010).
2. 2) Jansson A. and Palmberg J., Separate Controls of meter-in and Meter-out Orifices in Mobile Hydraulic Systems, SAE Transactions, Vol. 2, p. 377-383, (1999).
3. 3) Liu S. and Yao B., Energy-saving Control of Single-rod Hydraulic Cylinders with Programmable Valves and Improved Working Mode Selection, SAE Transactions - Journal of Commercial Vehicle, p. 51-61 (2002).
4. 4) Andersson B. and Martin A., New Technologies Applied to Electrohydraulic Controls, SAE Technical Paper 961799, Vol.105, No.2, p. 262-267 (1996).
5. 5) Lumkes J. H. and Andruch J., Hydraulic Circuit for Reconfigurable and Efficient Fluid Power Systems, in The 12th Scandinavian International Conference on Fluid Power, Vol.1, p. 83-98 (2011).