Ivanova, E. Value orientations of optimists and pessimists [Электронный ресурс] / Ivanova Ekaterina, Ershova Natalia // Modern university sport science : 8 International Scientific and Practical Conference of Students and Young Scientists, May 27 - 28, 2014 / Ministry of sport of Russian Federation, Russian State University of Physical Education, Sport, Youth and Tourism. - Moscow, 2014. - С. 51-? - Текст: англ. - Библиогр.: с. ? (? назв.).
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