Chen, Qihuai; Ren, Haoling; Lin, Tianliang; Miao, Cheng; Fu, Shengjie: 'Design and optimisation of cushioning structure of hydraulic free-piston engine', The Journal of Engineering, 2019, 2019, (13), p. 54-59, DOI: 10.1049/joe.2018.8966
IET Digital Library, https://digital-library.theiet.org/;jsessionid=3g7pdntp05hdq.x-iet-live-01content/journals/10.1049/joe.2018.8966