1 C.M. Volk, and J.. Levine, Analytical Estimation of Carrier Multipath Bias on GPS Position Measurements (1994).
1 M.L. Kohl, and J.. Levine, Journal of Research of the National Institute of Standards and Technology 98, (1993).
1 M.A. Weiss, D.W. Allan, D.D. Davis, and J.. Levine, IEEE Transactions on Instrumentation and Measurement 41, (1992).