1. Mills, D.L., A. Thyagarajan, and B.C. Huffman, Internet timekeeping around the globe, Proc. Precision Time and Time Interval (PTTI) Applications and Planning Meeting, Long Beach, CA, December 1997.
2. Time and Frequency (Time-Domain) Characterization, Estimation, and Prediction of Precision Clocks and Oscillators
3. Improved algorithms for synchronizing computer network clocks
4. An algorithm to synchronize the time of a computer to universal time