Lu, Y. (1997). Theoretical and experimental studies of a long stroke pumping unit with an auto-mechanical reverse mechanism and a sliding counterweight. Oulun yliopisto.
Chicago-referens (17:e uppl.)Lu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulu: Oulun yliopisto, 1997.
MLA-referens (8:e uppl.)Lu, Yi. Theoretical and Experimental Studies of a Long Stroke Pumping Unit with an Auto-mechanical Reverse Mechanism and a Sliding Counterweight. Oulun yliopisto, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.