1. Achten, P. A. J. (2007a). The hybrid transmission. SAE Paper No. 2007-01-4152.
2. Achten, P. A. J. (2007b). Changing the paradigm. Proc. 10th Scandinavian Int. Conf. Fluid Power, SICFP’07, Tampere, Finland.
3. Achten, P. A. J. (2009). A serial hydraulic hybrid drive train for off-road vehicles. Form http://www.deltamotion.com/peter/Hydraulics/Innas/HYDRID/Technical%20Papers%20Hydrid/HD03%20HyDrid%20for%20off%20road%20vehicles.pdf
4. Achten, P. A. J., Fu, Z. and Vael, G. E. M. (1997). Transforming future hydraulics: A new design of a hydraulic transformer. Proc. 5th Scandinavian Int. Conf. Fluid Power, SICFP’97, Part 3, Linkoping University.
5. Achten, P. A. J., Vael, G. E. M., Sokar, M. I. and Kohmascher, T. (2008). Design and fuel economy of a series hydraulic hybrid vehicle. Proc. 7th JFPS Int. Sym. Fluid Power, Toyama.