منابع مشابه
Ecological and Toxicological Conditions in the Delta Volga River
The decrease in the level of industrial production and the significant reduction of highly toxic substances used in the agriculture of the Volga region in the last decade did not maintain the expected decrease of pollution level in the Volga water. Concentration of many polluting substances in water continues to remain high. Among the numerous polluting substances in the Volga River two groups ...
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15 صفحه اولThe Hopf Conjecture and the Singer Conjecture
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ژورنال
عنوان ژورنال: Annals of Combinatorics
سال: 2020
ISSN: 0218-0006,0219-3094
DOI: 10.1007/s00026-020-00517-0