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Demografičeskie processy v SSSR : sbornik naučnych trudov
Volkov, Andrej G., (1990)
Morbidity factors and trends and their connexion with the level of mortality in the Union of Soviet Socialist Republics
Ovcharov, V. K., (1967)
The importance of morbidity statistics in the evaluation of public health
Brushlinskaya, L. A., (1967)