James R. Borcheding, "Smart ID Tags Wire Cows for Profit", Successful Farming, Mar. 1986, pp. D5, D6 and D8. |
"The 311 Electronic Tag Identification and Data Collection System for Automated Feeding and Weighing of Animals"; Eureka Electronic Identification Brochure, Eureka Systems, Inc. |
"The Calan Feeding Controls System for Dairy Cows", American Calan catalog, p. 22. |
"The Earmarq System", Eureka Electronic Identification Brochure, Eureka Systems. |
"Get the Allflex Advantage" brochure, 1993, Allflex USA, Inc. |
"Livestock Identification Ear Tags" brochure, Y-Tex Corporation. |