Analysis of the minimum working length of case in three screw pump
WANG Zhaowu , ZHENG Meisheng,SHAN Yuxia ,CHENG Aihua
JOURNAL OF NANJING FORESTRY UNIVERSITY . 2011, (06): 116 -120 .  DOI: 10.3969/j.jssn.1000-2006.2011.06.024