1. A novel method for analyzing the driving force of the bi-directional pig based on the four-element model. (April 2021) Authors: Liu, Chang; Cao, Yuguang; Tian, Hongjun; Ma, Shuai Journal: International journal of pressure vessels and piping Issue: Volume 190(2021) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗