1. N. N. Markov, G. B. Kainer, and P. A. Satserdotov, Errors and Choice of Instruments in Linear Measurements [in Russian], Mashinostroenie, Moscow (1967).
2. P. L. Chebyshev, Collected Works [in Russian], Vol. 2, Izd. AN SSSR, Moscow-Leningrad (1947).