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https://weapons-russia.ru/article/i-15
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https://hu.wikipedia.org/wiki/Nyikolaj_Nyikolajevics_Polikarpov
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https://www.worldcat.org/identities/lccn-n86-033636
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https://viaf.org/viaf/57715208
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http://lccn.loc.gov/n86033636
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http://isni.org/isni/0000000120181126
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https://d-nb.info/gnd/130278432
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https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=js2011646674&CON_LNG=ENG
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https://en.wikipedia.org/wiki/Nikolai_Nikolaevich_Polikarpov
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https://en.wikipedia.org/wiki/Grigori_Shtern
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