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==Nexus externi==
* [http://e-heritage.ru/ras/view/person/history.html?id=46998081 De Ioanne
*[http://www.ras.ru/win/db/show_per.asp?P=.id-50587.ln-ru.dl-.pr-inf.uk-12 De Ioanne
{{Lifetime|1738|1784|Islen'ev, Ioannes Ioannis filius}}
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