| 21. | He was also a corresponding member of Societas eruditorum incognitorum in terris Austriacis.
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| 22. | Since 1984 he was a corresponding member of the Russian Academy of Sciences.
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| 23. | In 1968 he became a corresponding member of the International Academy of Astronautics.
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| 24. | In 2013, Ursu became a corresponding member of the Romanian Academy.
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| 25. | He is a corresponding member of Russian Academy of Natural Sciences.
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| 26. | He is a Corresponding Member of the Russian Academy of Arts.
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| 27. | He was also a corresponding member of the Institut de France.
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| 28. | In 1966 he became a Corresponding member of the USSR Academy of Sciences.
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| 29. | In the 1970s he was named corresponding member of the Institut de France.
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| 30. | In 1910 Kapterev was elected Corresponding Member of the Imperial Academy of Sciences.
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