3Marnet P G, McKusick B C. Regulation of milk ejection and milking ef'ficiency in small ruminants[J]. Livest. Prod. Sci, 2001,70:125 133.
4Ulrich Str~Sbel, Sandra Rose-Meierhofer, H ii lya{)z, Reiner Brunsch. Development of" a Control System for the Teat End Vacuum in Individual Quarter Milking Systems[J]. Sensors, 2013, 13: 7633-7651.