1. 1. Lehman, H. C. (1935). The chronological ages of greatest product ivity chemist, inventors, poets et altera. Psychological Bulletin, 2(9).
2. 2. Lehman, H. C. (1953). Age and Achievement. Princeton University Press, Princeton, New Jersey. 372 р.
3. 3. Perna, N. Ya. (1925). The rhythm of life and creativity. Leningrad, Moscow, Petrograd. 144 р. [in Russian].
4. 4. Quetelet, A. (1869). Physique sociale: ou Essai sur le développement des facultés de l'homme. Belgium C. Muquardt. 526 р.
5. 5. Pelts, D., Andrews, F. (1973). Scientists in organizations. About optimal conditions for research and development. Moscow. 471 р. [in Russian].