1. Manometric Methods;Dixon,1934
2. Foss North America, 2001. DairyLab 2 (Specifications). Eden Prairie, MN, USA.
3. Jenkins, D.M., 2001. Manometric Sensor to Measure Urea in Milk for Improvement of Dairy Cow Nutritional Management. Ph.D. Dissertation, University of California, Davis, CA, USA.
4. Manometric biosensor for on-line measurement of milk urea;Jenkins;Biosensors and Bioelectronics,2002
5. Chemical assay of urea for automated sensing in milk;Jenkins;Journal of Dairy Science,1999