1. Afanasiev, V. L., Grudzinsky, M. A., Katz, B. M., Noschenko, V. S., & Zukkerman, I. I. 1986, in Avtomatizirovannye sistemy obrabotki izobrazhenij (Moscow: Nauka, Russian), 182
2. Bevington, Ph. R. 1975, Data reduction and error analysis for the physical sciences, NY, San Francisco, St. Louis (McGraw-Hill Book Company)