Optimum design of seat region in valves suitable for digital displacement machines. - Daniel Beck Roemer; Per Johansen; Henrik Pedersen; Torben Ole Andersen (Int. J. Mechatronics Autom., 2014)

Spectrum Estimation in Autocalibration of Ultrasonic Reflectometry Methods for Lubrication Film Thickness Measurements. - Rasmus Leck Kæseler; Per Johansen (ICCMA, 2018)

Layer ToF Methods for Ultrasonic Lubrication-film Thickness Measurements. - Rasmus Leck Kæseler; Nicolaj W. Johansen; Per Johansen (ICCMA, 2018)