3Albert J Molnar,Fred H wolff.Torque amplification factor(TAF) analysis and tests on two bar mill stands[J].Iron and Steel Eng,1981,(1):34-37.
4He Jian-jun,Yu Shou-yi,Zhong Jue.Modeling for driving systems of four high rolling mill[J].Transactions of Nonferrous Metals Society of China(English Edition),2002,12(1):88 -92.