Mathematics : - Aleksandrov, A. D. (Aleksandr Danilovich), 1912-1999; Lavrentev, M. A. (Mikhail Alekseevich), 1900-1980; Hirsch, K. A.; Kolmogorov A. N. (Andrei Nikolaevich), 1903-1987 (The M.I.T. Press, 1986)